CN103603659B - Utilize the method for Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through - Google Patents
Utilize the method for Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through Download PDFInfo
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Abstract
The invention discloses a kind of method utilizing Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through, and the well-log information fluid type discrimination technology field of oilfield prospecting developing.Step is: the first step: make a distinction according to the ratio large young pathbreaker gas-bearing formation of neutron porosity/acoustic porosity or density porosity and non-gas-bearing formation, described non-gas-bearing formation comprises dried layer, Gas-Water Contant and water layer; Second step: adopt hole-full intersection the Effective Reservoirs in described non-gas-bearing formation and invalid reservoir region to be separated; 3rd step: for the Effective Reservoirs of second step, adopts hole-electric intersection, and comprehensively identifies the fluid type of reservoir in conjunction with gas detection logging.This method efficiently solves when only having Using Conventional Logs, how to evaluate the technical problem of fluid type identification of the high hole dried layer of tool height irreducible water feature, mesopore dried layer, high resistant water layer, high-gas resistance water layer well, to efficiently solve with horse man ditch group be representative, and this class Reservoir type differentiates this difficult difficult problem.
Description
Technical field
The present invention relates to the well-log information fluid type discrimination technology field of oilfield prospecting developing.
Background technology
Soviet Union 5 and peach 7 block horse man ditch are a set of weathering Karst-type reservoirs, and reservoir reservoir space is based on hole, and Reservoir Section degree of porosity is mainly between 3 ~ 7%, and reservoir thickness, between 0.5 ~ 1.5m, has the feature that degree of porosity is low, reservoir thickness is thin.Low hole reservoir often complex pore structure, resistivity curve reflects the feature such as rock texture, pore structure to a greater extent, and convection cell reflection is insensitive, and this brings very large difficulty to fluid properties differentiation.
Soviet Union 5 and peach 7 block horse man ditch group formation testing 41 mouthfuls, wherein gas well only 5 mouthfuls, dry-well but up to 15 mouthfuls, gas stringer 4 mouthfuls, gas-water well 9 mouthfuls, 8 mouthfuls, well (producing well containing micro-gas).From formation testing achievement, in work area, there is the well of a large amount of high holes dried layer, mesopore dried layer, from production fluid type, air water with layer and water layer well in the majority, from the Resistivity Characteristics of formation testing interval, high resistant water layer, high-gas resistance water layer well are a lot.Disclose a ditch group reservoir of going into action and namely relate to the problem that effective reservoir evaluates difficulty, relate to again fluid type and differentiate this two hang-up difficult.Horse man ditch group fluid type only identifies Effective Reservoirs when differentiating, the tackling key problem carrying out fluid type discrimination technology for Effective Reservoirs is only significant.On earth in work area a large amount of middle and high holes reservoir not the reason of production fluid be in what work area, how to evaluate the validity of reservoir when only having Using Conventional Logs.The problem how identified for gas-bearing formation, high resistant water layer, high-gas resistance water layer well is all the difficult problem needing to solve.
At present, knownly on the market sentence in method for distinguishing to fluid type of reservoir through, most main flow have following three kinds of methods:
1, publication number is 101806215A, publication date is a kind of method that the Chinese patent literature on August 18th, 2010 discloses irreducible water saturation discriminating data fluid type of reservoir through, relate to petroleum gas well logging, geology and rock core test analysis technical field, this method is by analyzing reservoir rock granularity, on the basis of the irreducible water influence factors such as pore structure, rock core information scale is logged well, accurate calculating reservoir shale content, rock composition, degree of porosity, the reservoir parameters such as water saturation, ooze according to rock core the Pore structure degree of porosity statistics that experimental data obtains mutually and return irreducible water saturation formula.Utilize irreducible water and the moveable water result discrimination of reservoir fluid type of this formulae discovery, compared with formation testing result, coincidence rate, up to 90%, achieves good Effect of geological application;
2, publication number is 101787884A, publication date is that the Chinese patent literature on July 28th, 2010 discloses a kind of acoustic porosity and neutron porosity method for judging reservoir fluid type of difference between, relate to petroleum gas well logging, geology and rock core test analysis technical field, step comprises: 1) by the well logging of rock core information scale, well-log information environmental correction, accurately calculate reservoir shale content, rock composition, acoustic porosity and neutron porosity; 2) impact on interval transit time and neutron data of lithology, hole diameter and slurry compounding factor is got rid of; 3) utilize interval transit time and neutron data to the response difference of natural gas and formation water, distinguishing reservoir fluid type standard is set up by the size comparing sound wave hole and neutron porosity, the nonfluid influence factors such as lithology, borehole condition, mud immersion are eliminated during discrimination of reservoir fluid type of the present invention, thus can grasp the influencing characterisitic of different fluid to interval transit time and neutron data truly, make distinguishing reservoir fluid type coincidence rate bring up to more than 90% by existing 70%.
3, publication number is 101930082A, publication date is that the Chinese patent literature on December 29th, 2010 discloses a kind of method adopting resistivity data to carry out distinguishing reservoir fluid type, relate to petroleum gas well logging, geology and rock core test analysis technical field, step comprises: a, logged well by rock core information scale, accurately calculates reservoir shale content, rock composition and degree of porosity; B, eliminating lithology and degree of porosity are on the impact of resistivity; C, utilize core experiment to obtain m, a, n, b to reflect the parameter of pore structure, calculate gas-bearing formation resistivity lower limit RR, evacuation aperture gap structure is on the impact of resistivity; D, the size discrimination of reservoir fluid type of gas-bearing formation lower limit resistivity value RR by obtaining in deep induction-deep lateral resistivity value RT and step c.This method eliminates the nonfluid factors such as lithology, degree of porosity, pore structure to the impact of resistivity, retains and utilizes the response characteristic to resistivity different fluid, thus can greatly improve distinguishing reservoir fluid type coincidence rate.
But, with the prior art that above-mentioned three kinds of patent documents are representative, it needs NMR logging data could reflect the pore structure characteristic of reservoir, when only there being Using Conventional Logs (natural potential, natural gamma, compensated neutron, compensation density, compensation sound wave and dual laterolog), above-mentioned prior art is all inapplicable, cannot solve when only having Using Conventional Logs, how evaluate the technical barrier of fluid type identification of the high hole dried layer of tool height irreducible water feature, mesopore dried layer, high resistant water layer, high-gas resistance water layer well.
Summary of the invention
The present invention is intended to for the defect existing for above-mentioned prior art and deficiency, a kind of method utilizing Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through is provided, this method efficiently solves when only having Using Conventional Logs, how to evaluate the technical problem of fluid type identification of the high hole dried layer of tool height irreducible water feature, mesopore dried layer, high resistant water layer, high-gas resistance water layer well, to efficiently solve with horse man ditch group be representative, and this class Reservoir type differentiates this difficult difficult problem.
The present invention realizes by adopting following technical proposals:
Utilize a method for Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through, it is characterized in that:
The first step: make a distinction according to the ratio large young pathbreaker gas-bearing formation of neutron porosity/acoustic porosity or neutron porosity/density porosity and non-gas-bearing formation, described non-gas-bearing formation comprises dried layer, Gas-Water Contant and water layer;
Second step: adopt hole-full intersection the Effective Reservoirs in described non-gas-bearing formation and invalid reservoir region to be separated;
3rd step: for the Effective Reservoirs of second step, adopts hole-electric intersection, and comprehensively identifies the fluid type of reservoir in conjunction with gas detection logging.
In the described first step, the ratio of neutron porosity/acoustic porosity or neutron porosity/density porosity be greater than 1.3 be non-gas-bearing formation, ratio be less than 1.3 be gas-bearing formation.
In described second step, hole-full intersection is passing hole porosity φ and water saturation S
win cross plot, the distribution characteristics of data point judges that whether reservoir is containing moveable water, if plotted point is nearly hyperbola distribution rule, reservoir is described only containing irreducible water, not containing moveable water, is judged as dried layer; If plotted point is obvious dispersed, illustrate that reservoir is containing moveable water, reservoir is Gas-Water Contant or water layer.
In described 3rd step, be that the data adopting degree of porosity and resistivity cross plot to find out to drop on water saturation to be greater than in 60% region are water layer.
In described 3rd step, in the region that water saturation is less than 60%, the differentiation of Gas-Water Contant and water layer, differentiates in conjunction with gas measuring logging data, specifically adopts resistivity and total hydrocarbon cross plot to differentiate, wherein total hydrocarbon value be greater than 12% for Gas-Water Contant, the water layer that total hydrocarbon value is less than 12%.
Compared with prior art, the technique effect that reaches of the present invention is as follows:
First this be not first distinguish Effective Reservoirs and invalid reservoir, but first Direct Recognition goes out gas-bearing formation, and first got around the problem that effective reservoir is evaluated, this is one of key point of the present invention.Ratio large young pathbreaker gas-bearing formation and the non-gas-bearing formation (dried layer, Gas-Water Contant, water layer) of foundation neutron porosity/sound wave (density) porosity value make a distinction.Effective Reservoirs in non-gas-bearing formation and invalid reservoir region separate by preferred again hole-full intersection, for the preferred again hole-electric intersection of Effective Reservoirs, and comprehensively identifies the fluid type of reservoir in conjunction with gas detection logging.This cover technology solves when not having new Logging Technology data, how to evaluate the technical problem of fluid type identification of the high hole dried layer of tool height irreducible water feature, mesopore dried layer, high resistant water layer, high-gas resistance water layer well, meanwhile, also to efficiently solve with horse man ditch group be representative, and this class Reservoir type differentiates this difficult difficult problem.Greatly can reduce the input of oil field in new technology well logging, and improve the exploration effects not surveying new technology data oil field.
Accompanying drawing explanation
Below in conjunction with specification drawings and specific embodiments, the present invention is described in further detail, wherein:
Fig. 1 is the signal plate differentiating fluid type according to neutron porosity/sound wave (or density) porosity value size;
Fig. 2 is the cross plot of formation testing dried layer sector hole porosity and water saturation;
Fig. 3 is resistivity and degree of porosity cross plot;
Fig. 4 is resistivity and total hydrocarbon cross plot;
Fig. 5 is the schematic flow sheet of this method.
Detailed description of the invention
Embodiment 1
As most basic embodiment of the present invention, it operates according to the flow process of Fig. 5, can complete the technology utilizing Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through, and concrete grammar is:
The first step: according to neutron porosity/sound wave (or density) porosity ratio size discrimination gas-bearing formation and non-gas-bearing formation (water layer, Gas-Water Contant and dried layer).
Second step: for non-gas-bearing formation, Effective Reservoirs and invalid reservoir region well can separate by preferably apertures-full intersection;
3rd step: adopt hole-electric intersection and gas-bearing formation well logging to combine for Effective Reservoirs and further Gas-Water Contant and pelagic division are separated.
Embodiment 2
As preferred forms of the present invention, it is applied in, and to sentence method for distinguishing with horse man ditch group this class Reservoir type that is representative as follows:
The first step: Fig. 1 is all gas testing interval neutron porosity/sound waves (density) of horse man ditch group and sound wave (density) cross plot, and as can be seen from Figure 1, formation testing is that its neutron porosity/sound wave (density) porosity value of well of gas-bearing formation is generally less than 1.3; And formation testing is Gas-Water Contant, water layer and dried layer, its value is generally greater than 1.3.For high hole dried layer, just do not produce the high irreducible water water layer of moveable water, this is also why high hole dried layer or low-productivity layer (comprising low gas pay) its value also can be greater than the reason of 1.3.
Second step, is greater than the non-gas-bearing formation of 1.3 for neutron porosity/sound wave (density) porosity value, Effective Reservoirs and invalid reservoir region well can separate by preferably apertures-full intersection.Hole-full intersection is by φ-S
win cross plot, the distribution characteristics of data point judges that whether reservoir is containing moveable water, if plotted point is nearly hyperbola distribution rule, reservoir is described only containing irreducible water, not containing moveable water, is judged as dried layer; If plotted point is obvious dispersed, illustrate that reservoir is containing moveable water, reservoir is the same layer of air water, water layer etc.The identification coincidence rate of the method to many mouthfuls high hole dried layer reaches 100%, and if Soviet Union 5-15-1 and Soviet Union 5-3-18 two mouthfuls of well surveying examinations are dried layer, but reservoir porosity is high, thickness thick (Fig. 2).Use the method to differentiate 61 layers of non-gas-bearing formation class, meet 49 layers, coincidence rate 80.3%.Totally it seems, utilize Using Conventional Logs to reach such differentiation effect ideal.Obtaining such differentiation effect is that this method of discrimination has good compliance because horse man some dried layer of ditch group are all a little layers because pore throat footpath is little with high irreducible water feature.
3rd step, separates Gas-Water Contant and pelagic division further for Effective Reservoirs.Hole-electric crossplot can find out that dropping on the data that water saturation is greater than in 60% region is water layer, but Gas-Water Contant and water layer have more distribution in the region that water saturation is less than 60%, be not easily distinguishable (Fig. 3), as low hole section exists a large amount of high resistant water layer, which reflects the pore structure characteristic that litho-electric parameters that this rock-electric test determines might not reflect whole Reservoir Section, also reflects the ditch group Reservoir Section pore structure characteristic change of horse man greatly, complex pore structure, this is also the rule that most of carbonate formation has.Trial have employed bilateral to the method for difference, resistivity absolute-value scheme, P
1/2normal probability distribution method etc. all can not obtain certain effect.For the reservoir of this kind of Complicated Pore Structures, be no matter adopt electrical method method or non-electrical method logging method to distinguish Gas-Water Contant and water layer remains a difficult problem, a large amount of practical experience also confirms that the identification of Gas-Water Contant and water layer in carbonate rock gas field is often difficult to.This research to be done the Gas-Water Contant of complicated reservoirs and water layer in conjunction with gas measuring logging data and is differentiated, research shows, air water is relatively high with the Gas Logging Value of layer, although some water layer section resistivity are high, Gas Logging Value is low.In Fig. 4, the total hydrocarbon value of Gas-Water Contant is greater than 12%, and the total hydrocarbon value of water layer is generally less than 12%.This feature is utilized to solve the fluid type discrimination of such reservoir.
In reality, the solution employing said system achieves good effect, effectively solves horse man ditch group Reservoir type and differentiates this difficult problem difficult.
Claims (5)
1. utilize a method for Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through, it is characterized in that:
The first step: make a distinction according to the ratio large young pathbreaker gas-bearing formation of neutron porosity/acoustic porosity or neutron porosity/density porosity and non-gas-bearing formation, described non-gas-bearing formation comprises dried layer, Gas-Water Contant and water layer;
Second step: adopt hole-full intersection the Effective Reservoirs in described non-gas-bearing formation and invalid reservoir region to be separated;
3rd step: for the Effective Reservoirs of second step, adopts hole-electric intersection, and comprehensively identifies the fluid type of reservoir in conjunction with gas detection logging.
2. the method utilizing Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through according to claim 1, it is characterized in that: in the described first step, the ratio of neutron porosity/acoustic porosity or neutron porosity/density porosity be greater than 1.3 be non-gas-bearing formation, ratio be less than 1.3 be gas-bearing formation.
3. the method utilizing Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through according to claim 1 and 2, is characterized in that: in described second step, and hole-full intersection is passing hole porosity φ and water saturation S
win cross plot, the distribution characteristics of data point judges that whether reservoir is containing moveable water, if plotted point is nearly hyperbola distribution rule, reservoir is described only containing irreducible water, not containing moveable water, is judged as dried layer; If plotted point is obvious dispersed, illustrate that reservoir is containing moveable water, reservoir is Gas-Water Contant or water layer.
4. the method utilizing Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through according to claim 3, it is characterized in that: in described 3rd step, is that the data adopting degree of porosity and resistivity cross plot to find out to drop on water saturation to be greater than in 60% region are water layer.
5. the method utilizing Using Conventional Logs identification Complicated Pore Structures fluid type of reservoir through according to claim 4, it is characterized in that: in described 3rd step, the differentiation of Gas-Water Contant and water layer in the region that water saturation is less than 60%, differentiate in conjunction with gas measuring logging data, resistivity and total hydrocarbon cross plot is specifically adopted to differentiate, wherein total hydrocarbon value be greater than 12% for Gas-Water Contant, total hydrocarbon value be less than 12% be water layer.
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Effective date of registration: 20200922 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: The 1 section of No. 3 company Chuanqing Drilling Technology Information Office Chenghua District Green Road 610051 Chengdu City, Sichuan Province Patentee before: CNPC Chuanqing Drilling Engineering Co.,Ltd. |