CN103645519A - Volcanic rock weathering crust identification and classification standard based oil and gas exploration method - Google Patents
Volcanic rock weathering crust identification and classification standard based oil and gas exploration method Download PDFInfo
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Abstract
The invention relates to a volcanic rock weathering crust identification and classification standard based oil and gas exploration method. The volcanic rock weathering crust identification and classification standard based oil and gas exploration method comprises sorting basic data, performing well selection at the target position, establishing a water volcanic rock stratum contained volcanic rock weathering crust secondary porosity well logging evaluation model, establishing an oil-gas cement quality volcanic rock stratum contained volcanic rock weathering crust secondary porosity well logging evaluation model, obtaining a secondary porosity index in an oil-gas cement quality volcanic rock weathering crust, establishing a volcanic rock weathering crust structural identification and classification standard and performing oil and gas reserve evaluation according to structural characteristics of a volcanic rock weathering crust. According to the volcanic rock weathering crust identification and classification standard based oil and gas exploration method, the problem that analysis test data are less in the past and accordingly quantitative identification and classification cannot be performed on the volcanic rock weathering crust structure is solved, the area range of the identification and classification of the volcanic rock weathering crust structure is widened, and accordingly the oil field scientific research personnel can identify and classify out the volcanic rock weathering crust structure easily and the establishment of the volcanic rock weathering crust well logging evaluation models and the identification and classification standard is scientific and universal.
Description
Technical field
The present invention relates to a kind of Petroleum Exploration Methods, particularly about a kind of Petroleum Exploration Methods based on the identification of volcanics weathering crust and the criteria for classifying.
Background technology
Domestic some scholar first in Xinjiang, volcanics weathering crust feature has been carried out in three Hu Deng west areas, the pool and volcanics weathering crust feature is preserved the research of impact on oil gas, mainly thin slice, main secondary element and trace element under above-mentioned regional analysis outcrop, drilling and coring delivery, mirror, volcanics weathering crust is divided into five bands, i.e. final decomposition product (soil), hydrolysis band, leaching zone, disintegration band and not zone of weathering.Subsequently, some scholar has successively launched correlative study in eastern region again, is mainly the impact of defensive wall rift battalion of Xu family city group volcanics end face zone of weathering leaching phenomenon on volcanics storage and collection performance.Yet the method that adopts at present acoustic travel time logging curve, density logging curve, deep lateral resistivity logging trace and shallow side direction resistivity logging curve to divide volcanics weathering crust structure there is no report.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of science, the reasonable and effective Petroleum Exploration Methods based on the identification of volcanics weathering crust and the criteria for classifying.
For achieving the above object, the present invention takes following technical scheme: a kind of Petroleum Exploration Methods based on the identification of volcanics weathering crust and the criteria for classifying, comprises the following steps: 1) geologic data of target location and borehole log data are arranged; 2) according to choosing well demands, in target location, choose the well meeting the demands; 3) set up the volcanics weathering crust secondary porosity φ of moisture Stratum of Volcanic Rocks
secondary porositylogging estimation model:
In formula, ρ
skeletonfor volcanics skeletal density, g/cm
3; ρ
well loggingfor volcanics volume density, g/cm
3; ρ
waterfor volcanics mesoporosity fluid density, g/cm
3; Δ t
skeletonfor volcanics skeleton interval transit time, us/m; Δ t
well loggingfor actual measurement stratum interval transit time, us/m; Δ t
waterfor volcanics water interval transit time, us/m; 4) set up the volcanics weathering crust secondary porosity φ ' ' ' Logging estimation model of oily cementaceous Stratum of Volcanic Rocks:
In formula, S
hydrocarbon saturationfor hydrocarbon saturation in hole; V
shale indexfor shale index in volcanics; ρ
shalefor shale density in volcanics, g/cm
3; Δ t
shalefor shale interval transit time in volcanics, us/m; 5) obtain the secondary porosity index φ in oily cementaceous volcanics weathering crust
secondary porosity index; The oily cementaceous volcanics weathering crust secondary porosity of calculating is carried out to conventional 0-1 standardization, obtain the secondary porosity index φ in oily cementaceous volcanics weathering crust
secondary porosity index:
In formula, min φ ' ' ' is the minimum value in oily cementaceous volcanics weathering crust secondary porosity in selected well; Max φ ' ' ' is the maximal value in oily cementaceous volcanics weathering crust secondary porosity in selected well; 6) set up the identification of volcanics weathering crust structure and the criteria for classifying; According to secondary porosity index, set up volcanics weathering crust structure identification and the criteria for classifying is: from earth's surface to underground, volcanics weathering crust structure is divided into clay seam, hydrolysis band, corrosion band and disintegration band, each corresponding secondary porosity index is followed successively by 0.3～0.4%, 0.4～0.8%, 0.8～1% and 0.3～0.8%, and the volcanics not secondary porosity index of zone of weathering is 0～0.2%; 7) according to the architectural feature of volcanics weathering crust, evaluate hydrocarbon storage amount.
Described step 2) the requirement of selecting well is: 1. obvious red-clay profiles is arranged at target interval top, usings the distinguishing mark of red-clay profiles as volcanics weathering crust; 2. there is interval transit time logging trace; 3. there is density logging curve; 4. there is deep lateral resistivity logging trace; 5. there is shallow side direction resistivity logging curve.
In described step 3), first according to logging evaluation principle, set up the total porosity φ of moisture volcanics weathering crust
total porositywith primary porosity φ
primary porositycomputing formula:
Then according to material balance principle, set up Logging estimation model with the moisture volcanics weathering crust of quantitative evaluation secondary porosity φ
secondary porosity:
φ
secondary porosity=φ
total porosity-φ
primary porosity 
In described step 4), the density p under model oily cementaceous Stratum of Volcanic Rocks developmental state
well loggingcomputing formula (1):
ρ
well logging=[φ ' ρ
water+ (1-φ ') ρ
skeleton]-φ ' S
hydrocarbon saturation(ρ
water-ρ
oil gas)-V
shale index(ρ
skeleton-ρ
shale) (1)
By described computing formula (1), obtained the total porosity φ ' of oily cementaceous volcanics weathering crust:
Then set up the interval transit time Δ t of oily cementaceous volcanics weathering crust
shalecomputing formula (2):
Δ t
well logging=[φ ' ' Δ t
water+ (1-φ ' ') Δ t
skeleton]-φ ' ' S
hydrocarbon saturation(Δ t
water-Δ t
oil gas)-V
shale index(Δ t
skeleton-Δ t
shale) (2)
By described computing formula (2) the oily cementaceous volcanics weathering crust primary porosity φ ' ' formula of deriving to obtain:
Finally according to material balance principle, obtain Logging estimation model with quantitative evaluation oily cementaceous volcanics weathering crust secondary porosity φ ' ' ':
In described step 7), the secondary porosity index of the selected well calculating according to described step 1)～step 5), the identification of volcanics weathering crust structure and the criteria for classifying in conjunction with described step 6), set up, selected well is identified to clay seam, hydrolysis band, corrosion band, disintegration band and zone of weathering not successively from earth's surface to underground, and set up clay seam in weathering crust structure, be hydrolyzed band, corrosion band, disintegration band and the thickness spread figure of zone of weathering not; From geological condition, clay seam and hydrolysis band are good capping layers, and corrosion band and disintegration band are the accumulation zones of oil gas, and reservoir, is well lower storage upper cover type hydrocarbon-bearing pool; According to the hydrocarbon-bearing pool of the Thickness Evaluation target location of reservoir and capping layer in thickness spread figure.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, because utilizing logging evaluation principle, the present invention set up the Logging estimation model of a set of quantitative evaluation of volcanic rock weathering crust secondary porosity, and provide volcanics weathering crust structure to identify and the criteria for classifying, therefore overcome analytical test data in the past few and cannot quantitatively identify and divide the difficult problem of volcanics weathering crust structure, the regional extent of having widened the identification of volcanics weathering crust structure and having divided, make vast oil field scientific research personnel can more easily identify and mark off volcanics weathering crust structure, the foundation of volcanics weathering crust Logging estimation model and identification and the criteria for classifying has science and universality.2, due to the idiographic flow that the present invention proposes the identification of volcanics weathering crust structure and divide, therefore for oil field actual volcanics weathering crust exploration appraisal provides technical service support.The present invention can be widely used in various oil-gas exploration processes.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention;
Fig. 2 is that one section and three sections of loose distant basin Xu defensive wall rift battalion city group is selected well achievement schematic diagram;
Fig. 3 is loose distant basin Xu family defensive wall rift deep volcanic rock weathering crust structure identification and divides achievement schematic diagram;
Fig. 4 is that one section of volcanics weathering crust of loose distant basin Xu family defensive wall rift battalion city group is grown well location schematic diagram;
Fig. 5 is that one section of volcanics weathering crust of loose distant basin Xu family defensive wall rift battalion's city group connects well profile schematic diagram;
Fig. 6 is that loose distant basin Xu defensive wall rift battalion city group volcanics weathering crust is grown lithology statistics Nogata schematic diagram;
Fig. 7 improves thickness and does not improve thickness frequency Nogata schematic diagram in loose distant basin Xu defensive wall rift battalion city group volcanics weathering crust structure;
Fig. 8 is distance and the daily gas magnitude relation schematic diagram of loose distant basin Xu defensive wall rift battalion city element interval volcanics weathering crust end face;
Fig. 9 is that distance and the volcanics factor of porosity of loose distant basin Xu defensive wall rift battalion city element interval volcanics weathering crust end face is related to schematic diagram;
Figure 10 is loose distant basin Xu defensive wall rift battalion city group volcanics weathering crust development models schematic diagram.
Embodiment
First the present invention utilizes the moisture volcanics weathering crust of logging evaluation principle quantitative evaluation secondary porosity, then moisture volcanics weathering crust secondary porosity is compensated, to eliminate oil gas and the impact of shale on secondary porosity, obtain the secondary porosity of oily cementaceous volcanics weathering crust; Then according to secondary porosity index, set up identification and the criteria for classifying of volcanics weathering crust structure, finally according to the architectural feature of volcanics weathering crust, evaluate hydrocarbon storage amount.Above-mentioned logging evaluation principle is to utilize the log response feature of acoustic travel time logging curve to reflect the variation of primary porosity, utilize the log response feature of density logging curve to reflect the variation of total porosity, then according to material balance principle, be that secondary porosity equals total porosity and deducts primary porosity, calculate secondary porosity.Wherein, acoustic travel time logging curve utilizes sound velocity determination, and density logging curve utilizes electron density to measure.
The identification of volcanics weathering crust and the criteria for classifying that the present invention sets up are: the structure of volcanics weathering crust is by earth's surface to underground clay seam, hydrolysis band, corrosion band and the disintegration band of being divided into successively, and each corresponding secondary porosity index is 0.3～0.4%, 0.4～0.8%, 0.8～1% and 0.3～0.8% successively.
The inventive method comprises the following steps:
1) arrange basic data
The geologic data of target location and borehole log data are arranged, and wherein, geologic data comprises logging data, individual-layer data and well location data; Borehole log data comprises acoustic travel time logging curve, density logging curve, deep lateral resistivity logging trace and shallow side direction resistivity logging curve.
2) according to choosing well demands, in target location, choose the well meeting the demands
Select the requirement of well:
1. obvious red-clay profiles is arranged at top, usings the distinguishing mark of red-clay profiles as volcanics weathering crust;
2. there is interval transit time logging trace;
3. there is density logging curve;
4. there is deep lateral resistivity logging trace;
5. there is shallow side direction resistivity logging curve.
3) set up the volcanics weathering crust secondary porosity φ of moisture Stratum of Volcanic Rocks
secondary porositylogging estimation model
1. according to logging evaluation principle, set up moisture volcanics weathering crust total porosity φ
total porositywith primary porosity φ
primary porositycomputing formula:
2. according to material balance principle, set up moisture volcanics weathering crust secondary porosity φ
secondary porositylogging estimation model:
φ
secondary porosity=φ
total porosity-φ
primary porosity(3)
In formula, ρ
skeletonfor volcanics skeletal density, g/cm
3; ρ
well loggingfor volcanics volume density, g/cm
3; ρ
waterfor volcanics mesoporosity fluid density, g/cm
3; Δ t
skeletonfor volcanics skeleton interval transit time, us/m; Δ t
well loggingfor actual measurement stratum interval transit time, us/m; Δ t
waterfor volcanics water interval transit time, us/m.
4) set up the volcanics weathering crust secondary porosity φ ' ' ' Logging estimation model of oily cementaceous Stratum of Volcanic Rocks
Because while containing oil gas and shale in stratum, can affect the accuracy of the secondary porosity that logging principle evaluates out, thereby need to, to the volcanics weathering crust secondary porosity compensation in oily cementaceous Stratum of Volcanic Rocks, specifically comprise the following steps:
1. set up the density p under oily cementaceous Stratum of Volcanic Rocks developmental state
well loggingcomputing formula:
ρ
well logging=[φ ' ρ
water+ (1-φ ') ρ
skeleton]-φ ' S
hydrocarbon saturation(ρ
water-ρ
oil gas)-V
shale index(ρ
skeleton-ρ
shale) (5)
2. by formula (5), obtained the total porosity φ ' computing formula of oily cementaceous volcanics weathering crust:
3. set up the interval transit time Δ t of oily cementaceous volcanics weathering crust
shalecomputing formula:
Δ t
well logging=[φ ' ' Δ t
water+ (1-φ ' ') Δ t
skeleton]-φ ' ' S
hydrocarbon saturation(Δ t
water-Δ t
oil gas)-V
shale index(Δ t
skeleton-Δ t
shale) (7)
4. by formula (7), obtained the primary porosity φ ' ' computing formula of oily cementaceous volcanics weathering crust:
5. according to material balance principle, set up oily cementaceous volcanics weathering crust secondary porosity φ ' ' ' Logging estimation model:
In formula, S
hydrocarbon saturationfor hydrocarbon saturation in hole; V
shale indexfor shale index in volcanics; ρ
shalefor shale density in volcanics, g/cm
3; Δ t
shalefor shale interval transit time in volcanics, us/m.
5) obtain the secondary porosity index φ in oily cementaceous volcanics weathering crust
secondary porosity index
The oily cementaceous volcanics weathering crust secondary porosity of calculating in step 4) is carried out to conventional 0-1 standardization, obtain the secondary porosity index φ in oily cementaceous volcanics weathering crust
secondary porosity index:
In formula, min φ ' ' ' is the minimum value in oily cementaceous volcanics weathering crust secondary porosity in selected well; Max φ ' ' ' is the maximal value in oily cementaceous volcanics weathering crust secondary porosity in selected well.
6) set up the identification of volcanics weathering crust structure and the criteria for classifying
According to oily cementaceous volcanics weathering crust secondary porosity index, set up the identification of volcanics weathering crust structure and the criteria for classifying: from earth's surface to underground, volcanics weathering crust structure is divided into clay seam, hydrolysis band, corrosion band and disintegration band, wherein in volcanics, weathering is not partly positioned under disintegration band, be called not zone of weathering, the secondary porosity index corresponding with each structural sheet of volcanics weathering crust is respectively: clay seam 0.3～0.4%, hydrolysis is with 0.4～0.8%, corrosion band 0.8～1%, disintegration band 0.3～0.8%, volcanics is zone of weathering 0～0.2% not.Above-mentioned identification and the criteria for classifying are to have strict sequencing in the vertical, in practical operation, according to secondary porosity index, first delimit not zone of weathering of clay seam, corrosion band and volcanics, and hydrolysis band and disintegration band are just determined naturally, here first do not determine hydrolysis band and disintegration band, be because the secondary porosity index of hydrolysis band and disintegration band has same section, belong to the inevitable outcome of stratum weathering, can not avoid.
7) according to the architectural feature of volcanics weathering crust, evaluate the reserves of oil gas
The secondary porosity index of the selected well calculating according to step 1)～step 5), integrating step 6) identification of volcanics weathering crust structure and the criteria for classifying set up, selected well is identified to clay seam, hydrolysis band, corrosion band, disintegration band and zone of weathering not successively from earth's surface to underground, and set up clay seam in weathering crust structure, be hydrolyzed band, corrosion band, disintegration band and the thickness spread figure of zone of weathering not.From geological condition, clay seam and hydrolysis band are good capping layers, and corrosion band and disintegration band are the accumulation zones of oil gas, and reservoir, is well lower storage upper cover type hydrocarbon-bearing pool.According to the hydrocarbon-bearing pool of the Thickness Evaluation target location of reservoir and capping layer in thickness spread figure.The hydrocarbon-bearing pool of different regions is different from the thickness relationship of reservoir and capping layer.
Enumerate specific embodiment below, to have a better understanding of the present invention.
Embodiment: the distant basin of the pine of take defensive wall rift battalion of Xu family city group volcanics weathering crust is example, and the Petroleum Exploration Methods of application based on the identification of volcanics weathering crust and the criteria for classifying, evaluates hydrocarbon-bearing pool according to the architectural feature of volcanics weathering crust.Concrete steps are:
1) basic data settlement
Geologic data and borehole log data to the distant basin of pine defensive wall rift battalion of Xu family city group arrange, and wherein, geologic data comprises logging data, individual-layer data and well location data; Borehole log data comprises acoustic travel time logging curve, density logging curve, deep lateral resistivity logging trace and shallow side direction resistivity logging curve.
2) according to choosing well demands, in the distant basin of pine defensive wall rift battalion of Xu family city group, choose the well meeting the demands
Select the requirement of well:
1. obvious red-clay profiles is arranged at target interval top, usings the distinguishing mark of red-clay profiles as volcanics weathering crust;
2. there is interval transit time logging trace;
3. there is density logging curve;
4. there is deep lateral resistivity logging trace;
5. there is shallow side direction resistivity logging curve.
Based on above choosing well demands, one section or three sections of the distant basin of pine defensive wall rift battalion of Xu family city group, select 68 mouthfuls of wells, as shown in Figure 2, as can be seen from the figure, the well that red clay is grown at volcanics top is distributed in area and area, Anda in Xu more, from fault structure, controlled by Xu Xi fracture, Xu Dong fracture and Xu's Fracture.
3) set up the volcanics weathering crust secondary porosity φ of moisture Stratum of Volcanic Rocks
secondary porositylogging estimation model
According to formula (1)～(4), set up volcanics weathering crust secondary porosity φ in the moisture Stratum of Volcanic Rocks of evaluating one section or three sections selected well of Xu family defensive wall rift battalion's city group
secondary porositylogging estimation model.
4) set up the volcanics weathering crust secondary porosity φ ' ' ' Logging estimation model of oily cementaceous Stratum of Volcanic Rocks
Because while containing oil gas and shale in stratum, can affect the accuracy of the secondary porosity evaluated out of logging principle, thereby, need to compensate the volcanics weathering crust secondary porosity of oily cementaceous Stratum of Volcanic Rocks, according to formula (5)～(9), the secondary porosity in the oily cementaceous volcanics weathering crust of one section or three sections selected well of Xu family defensive wall rift battalion's city group is compensated the secondary porosity φ ' ' ' of quantitative evaluation oily cementaceous volcanics.
5) obtain the secondary porosity index φ in oily cementaceous volcanics weathering crust
secondary porosity index
The oily cementaceous volcanics weathering crust secondary porosity of calculating in step 4) is carried out to conventional 0-1 standardization according to formula (10), obtain the secondary porosity index φ in oily cementaceous volcanics weathering crust
secondary porosity index.
6) set up the identification of volcanics weathering crust structure and the criteria for classifying
According to oily cementaceous volcanics weathering crust secondary porosity index, set up the identification of volcanics weathering crust structure and the criteria for classifying: from earth's surface to underground, volcanics weathering crust structure is divided into clay seam, hydrolysis band, corrosion band and disintegration band, wherein in volcanics, weathering is not partly positioned under disintegration band, be called not zone of weathering, the secondary porosity index corresponding with each structural sheet of volcanics weathering crust is respectively: clay seam 0.3～0.4%, hydrolysis is with 0.4～0.8%, corrosion band 0.8～1%, disintegration band 0.3～0.8%, volcanics is zone of weathering 0～0.2% not.
Above-mentioned identification and the criteria for classifying are to have strict sequencing in the vertical, in practical operation, according to secondary porosity index, first delimit not zone of weathering of clay seam, corrosion band and volcanics, and hydrolysis band and disintegration band are just determined naturally, here first do not determine hydrolysis band and disintegration band, be because the secondary porosity index of hydrolysis band and disintegration band has same section, belong to the inevitable outcome of stratum weathering, can not avoid.
7) according to the architectural feature of volcanics weathering crust, evaluate the reserves of oil gas
The secondary porosity index of the selected well calculating according to step 1)～step 5), integrating step 6) identification of volcanics weathering crust structure and the criteria for classifying set up, selected well is identified to clay seam, hydrolysis band, corrosion band, disintegration band and zone of weathering not successively from earth's surface to underground, and set up clay seam in weathering crust structure, be hydrolyzed band, corrosion band, disintegration band and the thickness spread figure of zone of weathering not.From geological condition, clay seam and hydrolysis band are good capping layers, and corrosion band and disintegration band are the accumulation zones of oil gas, and reservoir, is well lower storage upper cover type hydrocarbon-bearing pool.According to the hydrocarbon-bearing pool of reservoir in thickness spread figure and capping layer Thickness Evaluation target location.The hydrocarbon-bearing pool of different regions is different with capping layer thickness relationship from reservoir.
The identification of setting up according to the present invention and the criteria for classifying identify 31 mouthfuls of real wells of growing volcanics weathering crusts in the distant basin of pine defensive wall rift battalion of an Xu family city group, and a bite well of take is wherein elaborated as example.
As shown in Figure 3, the distant basin of pine defensive wall rift battalion of Xu family city group volcanics weathering crust structure can be divided into clay seam, hydrolysis band, corrosion band and disintegration band from earth's surface to underground, and find that clay seam is high with the secondary porosity index that the secondary porosity index that is hydrolyzed band does not have corrosion band and disintegration band, matches with exploration knowledge.Clay seam and hydrolysis band rate of decay are higher, Weathering And Leaching effect causes bottom lag deposit, grow tight zone, can be used as the cap rock in weathering crust structure, and although corrosion band and disintegration band rate of decay do not have clay seam and hydrolysis band by force, but the secondary pores that weathering and erosion produces preserves well, can be used as reservoir in volcanics weathering crust structure.
As shown in Figure 4, multiple the educating in structure high-order bit of volcanics weathering crust that loose distant basin Xu defensive wall rift battalion city group is a section, mainly concentrates on area in Xu.Volcanics weathering crust is multiple educates in structure high-order bit, can improve volcanics weathering crust physical property, improves individual well daily output tolerance.
Set up many volcanics weathering crusts and connect well profile, take wherein one even well profile be elaborated as example:
As shown in Figure 5, the well of continuous distribution consists of Xu Shen 902 wells, Xu Shen 901 wells, Xu Shen 903 wells and Xu Shen 11, and in Xu, regional volcanics weathering crust has certain property in flakes, and the area of growth is larger, possesses the value that Development and Production is dropped in oil field.
As shown in Figure 6, this figure has reflected Xu family defensive wall rift deep volcanic rock weathering crust developmental state (31 mouthfuls of wells, 7170 meters), in ryolite, volcanic breccia and eruptive tuff, easily grow volcanics weathering crust (weathering ratio can reach 50%), andesite is relative with Irish touchstone poor.
Statistics Xu family defensive wall rift deep volcanic rock is grown weathering crust Jing31Kou, carry out weathering and improve volcanics physical property statistics, establishment does not improve thickness and improves thickness frequency histogram, as shown in Figure 7, as can be seen from the figure, reach dark 3 wells, reach dark 10, Xu Shen 211 wells, in volcanics weathering crust, to improve thickness near the well such as Xu Shen 901 wells, Xu Shen 903 wells, Xu Shen 13 wells, Xu Shen 3 wells, Xu Shen 9-3 well, Wang Shen 1 well, Xu Shen 6 wells, Xu Shen 9 wells, Xu Shen 5 wells relatively high, ranges up to 200m(Xu Shen 3 wells).In addition, Fig. 7 can also reflect that 31 mouthfuls of wells improve thickness and do not improve thickness intuitively, from Xu Shen 8 wells in left side, to the dark 3 volcanics improvement degree of reaching of right side, increases gradually.
Xu family's defensive wall rift deep volcanic rock weathering crust developmental state according to statistics, analyzing discovery volcanics weathering crust mainly grows at structure high-order bit and slope belt, in volcanics weathering crust, corrosion band, disintegration tape thickness are in 100m left and right, the distribution of volcanics weathering crust and THICKNESS CONTROL distribution and the production capacity of natural gas pool, as shown in Figure 8, as can be seen from the figure in weathering crust structure corrosion band, disintegration tape thickness at 100m, this THICKNESS CONTROL daily output tolerance, on average produce tolerance daily and be greater than 10 * 10
4m
3.
As shown in Figure 9, as can be seen from the figure in weathering crust structure, corrosion band, disintegration tape thickness, in 100m left and right, have improved volcanic reservoir spaces, and factor of porosity is more than or equal to 9%.
According to 31 mouthfuls of well volcanics weathering crust structures and mark off the distribution situation of volcanics weathering crust well, set up the development models of Xu family defensive wall rift deep volcanic rock weathering crust, as shown in figure 10, from scheming, can find out, the distant basin of pine Xu family defensive wall rift deep volcanic rock weathering crust structure, from earth's surface to underground, clay seam, hydrolysis band, corrosion band and disintegration band, consist of, the thickness respectively of growth is 19m, 32m, 55m and 63m.Can find equally, Xu family defensive wall rift deep volcanic rock weathering crust structure medium clay soil layer and hydrolysis band degree of crushing are higher, yet, Weathering And Leaching effect by the later stage causes the pore space of previously growth how blocked, pore space is preserved improper and agensis can be used as the cap rock in weathering crust structure; Corrosion band in weathering crust structure and disintegration band are poor with respect to clay seam and hydrolysis band rate of decay, and later stage preservation condition is better, and the secondary pore space of growth is all preserved, and can be used as volcanics weathering crust reservoir.
The various embodiments described above are only for illustrating the present invention; wherein the structure of each parts, connected mode and manufacture craft etc. all can change to some extent; every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (7)
1. the Petroleum Exploration Methods based on volcanics weathering crust identification and the criteria for classifying, comprises the following steps:
1) geologic data of target location and borehole log data are arranged;
2) according to choosing well demands, in target location, choose the well meeting the demands;
3) set up the volcanics weathering crust secondary porosity φ of moisture Stratum of Volcanic Rocks
secondary porositylogging estimation model:
In formula, ρ
skeletonfor volcanics skeletal density, g/cm
3; ρ
well loggingfor volcanics volume density, g/cm
3; ρ
waterfor volcanics mesoporosity fluid density, g/cm
3; Δ t
skeletonfor volcanics skeleton interval transit time, us/m; Δ t
well loggingfor actual measurement stratum interval transit time, us/m; Δ t
waterfor volcanics water interval transit time, us/m;
4) set up the volcanics weathering crust secondary porosity φ ' ' ' Logging estimation model of oily cementaceous Stratum of Volcanic Rocks:
In formula, S
hydrocarbon saturationfor hydrocarbon saturation in hole; V
shale indexfor shale index in volcanics; ρ
shalefor shale density in volcanics, g/cm
3; Δ t
shalefor shale interval transit time in volcanics, us/m;
5) obtain the secondary porosity index φ in oily cementaceous volcanics weathering crust
secondary porosity index
The oily cementaceous volcanics weathering crust secondary porosity of calculating is carried out to conventional 0-1 standardization, obtain the secondary porosity index φ in oily cementaceous volcanics weathering crust
secondary porosity index:
In formula, min φ ' ' ' is the minimum value in oily cementaceous volcanics weathering crust secondary porosity in selected well; Max φ ' ' ' is the maximal value in oily cementaceous volcanics weathering crust secondary porosity in selected well;
6) set up the identification of volcanics weathering crust structure and the criteria for classifying
According to secondary porosity index, set up volcanics weathering crust structure identification and the criteria for classifying is: from earth's surface to underground, volcanics weathering crust structure is divided into clay seam, hydrolysis band, corrosion band and disintegration band, each corresponding secondary porosity index is followed successively by 0.3～0.4%, 0.4～0.8%, 0.8～1% and 0.3～0.8%, and the volcanics not secondary porosity index of zone of weathering is 0～0.2%;
7) according to the architectural feature of volcanics weathering crust, evaluate hydrocarbon storage amount.
2. a kind of Petroleum Exploration Methods based on volcanics weathering crust identification and the criteria for classifying as claimed in claim 1, it is characterized in that: the requirement of selecting well described step 2) is: 1. obvious red-clay profiles is arranged at target interval top, using the distinguishing mark of red-clay profiles as volcanics weathering crust; 2. there is interval transit time logging trace; 3. there is density logging curve; 4. there is deep lateral resistivity logging trace; 5. there is shallow side direction resistivity logging curve.
3. a kind of Petroleum Exploration Methods based on the identification of volcanics weathering crust and the criteria for classifying as claimed in claim 1, is characterized in that: in described step 3), first according to logging evaluation principle, set up the total porosity φ of moisture volcanics weathering crust
total porositywith primary porosity φ
primary porositycomputing formula:
Then according to material balance principle, set up Logging estimation model with the moisture volcanics weathering crust of quantitative evaluation secondary porosity φ
secondary porosity:
φ
secondary porosity=φ
total porosity-φ
primary porosity
4. a kind of Petroleum Exploration Methods based on the identification of volcanics weathering crust and the criteria for classifying as claimed in claim 2, is characterized in that: in described step 3), first according to logging evaluation principle, set up the total porosity φ of moisture volcanics weathering crust
total porositywith primary porosity φ
primary porositycomputing formula:
Then according to material balance principle, set up Logging estimation model with the moisture volcanics weathering crust of quantitative evaluation secondary porosity φ
secondary porosity:
φ
secondary porosity=φ
total porosity-φ
primary porosity
5. a kind of Petroleum Exploration Methods based on volcanics weathering crust identification and the criteria for classifying as claimed in claim 1 or 2 or 3 or 4, is characterized in that: in described step 4), and the density p under model oily cementaceous Stratum of Volcanic Rocks developmental state
well loggingcomputing formula (1):
ρ
well logging=[φ ' ρ
water+ (1-φ ') ρ
skeleton]-φ ' S
hydrocarbon saturation(ρ
water-ρ
oil gas)-V
shale index(ρ
skeleton-ρ
shale) (1)
By described computing formula (1), obtained the total porosity φ ' of oily cementaceous volcanics weathering crust:
Then set up the interval transit time Δ t of oily cementaceous volcanics weathering crust
shalecomputing formula (2):
Δ t
well logging=[φ ' ' Δ t
water+ (1-φ ' ') Δ t
skeleton]-φ ' ' S
hydrocarbon saturation(Δ t
water-Δ t
oil gas)-V
shale index(Δ t
skeleton-Δ t
shale) (2)
By described computing formula (2) the oily cementaceous volcanics weathering crust primary porosity φ ' ' formula of deriving to obtain:
Finally according to material balance principle, obtain Logging estimation model with quantitative evaluation oily cementaceous volcanics weathering crust secondary porosity φ ' ' ':
6. a kind of Petroleum Exploration Methods based on volcanics weathering crust identification and the criteria for classifying as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: in described step 7), the secondary porosity index of the selected well calculating according to described step 1)～step 5), the identification of volcanics weathering crust structure and the criteria for classifying in conjunction with described step 6), set up, to selected well from earth's surface to the underground clay seam that identifies successively, hydrolysis band, corrosion band, disintegration band and not zone of weathering, and set up the clay seam in weathering crust structure, hydrolysis band, corrosion band, the thickness spread figure of disintegration band and not zone of weathering, from geological condition, clay seam and hydrolysis band are good capping layers, and corrosion band and disintegration band are the accumulation zones of oil gas, and reservoir, is well lower storage upper cover type hydrocarbon-bearing pool, according to the hydrocarbon-bearing pool of the Thickness Evaluation target location of reservoir and capping layer in thickness spread figure.
7. a kind of Petroleum Exploration Methods based on volcanics weathering crust identification and the criteria for classifying as claimed in claim 5, it is characterized in that: in described step 7), the secondary porosity index of the selected well calculating according to described step 1)～step 5), the identification of volcanics weathering crust structure and the criteria for classifying in conjunction with described step 6), set up, to selected well from earth's surface to the underground clay seam that identifies successively, hydrolysis band, corrosion band, disintegration band and not zone of weathering, and set up the clay seam in weathering crust structure, hydrolysis band, corrosion band, the thickness spread figure of disintegration band and not zone of weathering, from geological condition, clay seam and hydrolysis band are good capping layers, and corrosion band and disintegration band are the accumulation zones of oil gas, and reservoir, is well lower storage upper cover type hydrocarbon-bearing pool, according to the hydrocarbon-bearing pool of the Thickness Evaluation target location of reservoir and capping layer in thickness spread figure.
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