CN104698505A - Predicating method for high-gamma sandstones in source rocks - Google Patents
Predicating method for high-gamma sandstones in source rocks Download PDFInfo
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- CN104698505A CN104698505A CN201510003110.8A CN201510003110A CN104698505A CN 104698505 A CN104698505 A CN 104698505A CN 201510003110 A CN201510003110 A CN 201510003110A CN 104698505 A CN104698505 A CN 104698505A
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Abstract
The invention discloses a predicating method for high-gamma sandstones in source rocks. The predicating method comprises the following steps: firstly, determining an average natural-gamma logging lower limit value and siltstones of the source rocks and an average natural-gamma logging upper limit value of sandstones, drawing up a radioactive contour map of the source rocks on a plane, and identifying an area with relatively high radioactive value and an area with a relatively low radioactive value; drawing up a sand thickness contour map on the plane according to the sand rock thickness identified by normal logging in the area with the relatively high radioactive value and the area with the relatively low radioactive value; predicating high-gamma sandstones in the area with the relatively high radioactive value according to the sand body formation causes and a distribution pattern on the plane. The predicating method is simple to operate, easy to popularize and use, great in economic benefit, and capable of quickly and effectively predicating a compact oil favorable area.
Description
Technical field
The present invention relates to the Forecasting Methodology of high gamma sandstone in fine and close exploration activity technical field, particularly a kind of hydrocarbon source rock.
Background technology
The exploitation of fine and close oil takes the lead in obtaining successfully at U.S. Williston basin Ba Ken group (Bakken), causes increasing substantially of this type of oil reservoir output.The definition of U.S. EIA (2012) to fine and close oil is " utilizing the oil that lateral drilling and multistage hydraulic fracturing technology are exploited out from shale or other low-permeability reservoir ".On this basis, Chinese scholar merchant manufactures and waits (2012) to think " fine and close oil mainly refers to and the petroleum resources assembled in the reservoir such as the tight sand of the alternating layers symbiosis of oil source rock series of strata or next-door neighbour ".Zou Caineng etc. (2013) think that its storage pass, source is source storage symbiosis, mainly comprise source and store up one-piece type and source storage contact-type two type.
China's Continental Petroliferous Basins has good fine and close exploration activity prospect, the eruptive tuff symbiosis of the normal and eruptive activity of volcano origin cause of formation of its high quality source rock, the reflection regional tectonic activity that the enlivens same period may be the general main dynamics factors (Zou Caineng etc., 2014) in shale deposition phase most big lake.The activity such as lakebed hydrothermal solution of same period volcanic eruption and association thereof frequently, jointly facilitate rich hydrogen organic shale and highly radioactive extensive growth, as long in Ordos Basin 7 sections, Song-liao basin Qingshankou group one section, Bohai gulf basin sand disaster treatment and four sections, the Junggar Basin and three-state models reed grass ditch group etc.Domestic low to fine and close exploration activity degree, technology is immature, and compact oil reservoir Dominated Factors is unclear, and reservoiring theory or pattern need to be studied, and is totally still in the starting stage of moving steadily.
Generally oil show is found in the hydrocarbon source rock of Chinese Continental Petroliferous Basins, producing well is a lot, but it is more difficult to form productivity ratio, trace it to its cause, it is generally acknowledged that the output to fine and close oil such as oil properties and producing energy size has major effect (Zhang Linye etc.,, but to grow the interlayers such as a large amount of siltstone, sandstone in the higher well of in fact fine and close oil yield and hydrocarbon source rock in close relations 2014).This understanding is consistent with a large amount of fine and close oily production practices, namely the densification oil district had, oil directly originates from hydrocarbon source rock, but most fine and close oil originates from the interlayer (Canadian natural resources association (NRC), 2012) such as siltstone, sandstone in hydrocarbon source rock.
At present, the traditional logging methods such as natural gamma, density and resistivity are mainly applied in the identification of domestic and international each elephant hydrocarbon source rock.Because density and resistivity logging identification hydrocarbon source rock difficulty are large, therefore main or according to natural gamma ray log.Production practices show, grow a large amount of high gamma siltstone, sandstone, but conventional logging are often interpreted as " hydrocarbon source rock " in hydrocarbon source rock, make the growth scale of sand body in hydrocarbon source rock by substantially understate, do not draw attention for a long time.Main cause is as follows:
One, hydrocarbon source rock is normal with the eruptive tuff of the eruptive activity of volcano origin cause of formation, dignified limestone with contain tufaceous, tufaceous siltstone, sandstone symbiosis, causes the siltstone of hydrocarbon source rock and inside thereof, sandstone all to have high natural gamma log value (Qiu Xinwei etc., 2008; Yu Zhenfeng etc., 2012);
Its two, the overall oil-containings such as hydrocarbon source rock, siltstone and sandstone, make the resistivity logging value difference between different lithology not little;
Its three, the corrosion hole containing tufaceous, tufaceous siltstone, sandstone is all grown, and density, interval transit time, neutron well logging value are similar to hydrocarbon source rock;
Its four, siltstone, sandstone thickness are overall little, and are alternating layers outputs with hydrocarbon source rock, and thus its conventional logging affects larger by hydrocarbon source rock.
" high gamma sandstone " in sandstone be (Liu Hangjun etc., 2013 since formally proposition in 2013; Liu Hangjun, 2013), the Primary Study concept of this rocks, the origin cause of formation and conventional logging recognition methods, is mainly divided into I class (thin layer) and II class (thick-layer) according to thickness at present.At present, the understanding that there is high gamma sandstone in hydrocarbon source rock is not yet formally proposed both at home and abroad.The high gamma sandstone existed in hydrocarbon source rock is defined as the high gamma sandstone relevant to hydrocarbon source rock, and namely natural gamma ray log value is greater than " siltstone or the sandstone " of hydrocarbon source rock natural gamma ray log averaged lower bound value.Similar with " high gamma sandstone " in sandstone, mainly also can be divided into I class (thin layer) and II class (thick-layer) according to thickness.In practical operation, in " hydrocarbon source rock " that conventional logging is explained, this two classes height gamma sandstone common and hydrocarbon source rock are that alternating layers occur, be conducive to oil-gas generation, itself be also good densification oil reservoir, but be unfavorable for the formation of thick-layer and high-quality hydrocarbon source rock, therefore when overall sandstone thickness is larger, when hydrocarbon source rock thickness is less or hydrocarbon generation capacity is poor, can be also high gamma sandstone by these lithology Unified Explanations.
Summary of the invention
The object of the invention is to solve the deficiencies in the prior art, provide a kind of simple to operate, only need conventional logging just can the method for predicting hydrocarbon Inside sourcerock height gamma sandstone.
For achieving the above object, the present invention implements according to following technical scheme:
A Forecasting Methodology for high gamma sandstone in hydrocarbon source rock, the method comprises the following steps:
The first step, first determines the natural gamma ray log average upper bound value of hydrocarbon source rock natural gamma ray log averaged lower bound value and siltstone, sandstone;
Second step, make hydrocarbon source rock natural gamma isogram in the plane, identify the radioactivity relatively high value region higher than averaged lower bound value and the relative low value region lower than averaged lower bound value, in radioactivity relatively high value region, grow high gamma sandstone, and in the relative low value region of radioactivity agensis height gamma sandstone;
3rd step, in the relative low value region of radioactivity and radioactivity relatively high value region, according to the sandstone thickness of conventional logging identification, makes sand thickness isogram in the plane;
4th step, according to distributional pattern on Genetic of Sandbodies and plane, the high gamma sandstone in radioactivity relatively high value regional prediction hydrocarbon source rock.
Further, in described radioactivity relatively high value region, the development degree of high gamma sandstone and radioactivity size have positive correlation.
Under the prerequisite that the ripe hydrocarbon source rock of extensive high-quality and adjacent large-area compact reservoir thereof are grown, the position of high gamma sandstone development in hydrocarbon source rock, storage one-piece type fine and close oil in source is normal grows, and the normal agensis of the fine and close oil of source storage contact-type; Otherwise, the high obsolete position of gamma sandstone in hydrocarbon source rock, the one-piece type fine and close oil of the source storage often agensis of source storage symbiosis, and the normal growth of the fine and close oil of source storage contact-type.
Compared with prior art, the present invention is the method adopting conventional logging predicting hydrocarbon Inside sourcerock sand body, simple to operate, can predict fine and close oily Favorable Areas quickly and efficiently, easily promote the use of, have huge economic benefit.
Accompanying drawing explanation
Fig. 1 is peaceful 138 wells long 7 of the embodiment of the present invention
3 2substratum well logging synthesizing map;
Fig. 2 is the length 7 of the embodiment of the present invention
3 2substratum natural gamma isogram;
Fig. 3 is the length 7 of the embodiment of the present invention
3 2little floor height gamma sandstone prediction synthesizing map;
Fig. 4 is peaceful 138 wells long 7 of the embodiment of the present invention
3 2little floor height gamma sandstone and hydrocarbon source rock are logged well synthesizing map.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment thereof, the invention will be further described, is used for explaining the present invention in illustrative examples of this invention and explanation, but not as a limitation of the invention.
It is southern that Heshui area, east, Gansu Province is positioned at her Shan ramp structure band of Ordos Basin, and this district's top integral function hydrocarbon source rock major developmental is at long 7 sections.According to sedimentary cycle, this head of district 7 sections divides long 7 from top to bottom
1, long by 7
2with long 7
3three Sand member, wherein grow 7
3sand member deposition period, basin lake basin area is maximum, is the extensive high-quality ripe hydrocarbon source rock main puberty.
Heshui ground, east, Gansu Province head of district 7
3sand member sedimentary environment, based on half dark lake-dark lake, is grown between the turbidity channel of Deep Water Turbidite Fan, turbidity channel, the microfacies such as dark lacustrine mud, high gamma sandstone development, as shown in Figure 1.Long 7
3the thick about 40.0m of Sand member, amasss the features such as Wei Xiang ﹑ extinct plants and animal according to Yan ﹑ Chen, be subdivided into long 7 from top to bottom
3 1substratum (thick about 20.0m) and long 7
3 2substratum (thick about 20.0m), most hydrocarbon source rock is positioned at long 7
3 2substratum.Long 7
3 2substratum lithology containing tufaceous, tuffaceous sandstone based on black hydrocarbon source rock, brown ash-grey, is pressed from both sides a small amount of gray powder Sandy Silt and black mudstone, can be similar to and think that hydrocarbon source rock thickness and sandstone thickness sum equal zone thickness.Long 7
3 2substratum sandstone rock type is landwaste feldspar or feldspar rock-fragment sandstone, and wherein detrital feldspar corrosion is generally grown, and accounts for 66.7% of total pore surface rate.With long 7
3 2the length 8 that substratum bottom is contiguous
1sand member belongs to thing source, southwest, basin system, reservoir based in the brown ash of braided river delta front parfacies distributary channel microfacies, grey-particulate feldspar rock-fragment sandstone, grow compact oil reservoir, non-reservoir mainly under water shunting between gulf microfacies (Yang Hua, 2004).
This area head 7
3 2the Forecasting Methodology of high gamma sandstone in substratum hydrocarbon source rock, comprises the following steps:
The first step, according to a large amount of actual production datas, determines long 7
3 2substratum hydrocarbon source rock natural gamma ray log value averaged lower bound is 180API, and sandstone natural gamma ray log value average upper bound is 180API.
Second step, reads all wells long 7
3 2substratum natural gamma maximal value, makes natural gamma isogram in the plane; In conjunction with conventional logging and well logging coring data, determine the scope that radioactive relatively high value region is mainly natural gamma value and is greater than 300API, often in it grow high gamma sandstone; And radioactive relative low value region is mainly the scope that natural gamma ray log value is less than 300API, normal agensis height gamma sandstone in it, as shown in Figure 2.
3rd step, in well logging and log data basis, identifies sandstone thickness, makes long 7 in the plane
3 2substratum sand thickness isogram, as shown in Figure 3.
4th step, according to long 7
3 2the substratum sand body turbidity current origin cause of formation and distributional pattern, be less than the radioactivity relatively high value regional prediction height gamma sandstone distribution of 300API, as Fig. 2, shown in 3 in natural gamma ray log value.
Predict the outcome and show, Heshui ground, east, Gansu Province head of district 7
3 2three east northeast-Nan Xi such as the profound horse-Qingcheng County of substratum major developmental, area just outside a city gate-slab bridge, Gu Cheng-dish visitor are to lithologic sand body, wherein west side, area just outside a city gate (as wellblock, the village 80), slab bridge southern side are (as peaceful 138 wellblocks, as shown in Figure 4), dish visitor (as wellblock, the village 233, as shown in Figure 1) etc. block grows a large amount of high gamma sandstone.
In sum, as shown in Figure 3, length 7 in plane
3 2the length 8 of substratum lithologic sand body development degree and its underpart vicinity
1the fine and close oil of Sand member becomes Tibetan to present negative correlation.A large amount of means of production show, long 7
3 2the growth of substratum lithologic sand body causes long 8
1the agensis of Sand member oil enrichment area, common stripper well (as the village 80 well etc.), wet well (as plate 107 well, peaceful 139 wells, Xi251Jing etc.) or have no oil reservoir display well (peaceful 32 wells, peaceful 138 wells, the village 233 well etc.); And long 7
3 2the obsolete position of substratum lithologic sand body, long 8
1sand member oil enrichment area is grown, common commercial oil well (as the village 51 well, the village 43 well, plate 16 well etc.).
Technical scheme of the present invention is not limited to the restriction of above-mentioned specific embodiment, the technology distortion that every technical scheme according to the present invention is made, and all falls within protection scope of the present invention.
Claims (2)
1. the Forecasting Methodology of high gamma sandstone in hydrocarbon source rock, comprises the following steps:
The first step, first determines the natural gamma ray log average upper bound value of hydrocarbon source rock natural gamma ray log averaged lower bound value and siltstone, sandstone;
Second step, make hydrocarbon source rock natural gamma isogram in the plane, identify the radioactivity relatively high value region higher than averaged lower bound value and the relative low value region lower than averaged lower bound value, in radioactivity relatively high value region, grow high gamma sandstone, and in the relative low value region of radioactivity agensis height gamma sandstone;
3rd step, in the relative low value region of radioactivity and radioactivity relatively high value region, according to the sandstone thickness of conventional logging identification, makes sand thickness isogram in the plane;
4th step, according to distributional pattern on Genetic of Sandbodies and plane, the high gamma sandstone in radioactivity relatively high value regional prediction hydrocarbon source rock.
2. high gamma sandstone Forecasting Methodology in hydrocarbon source rock according to claim 1, is characterized in that: in described radioactivity relatively high value region, the development degree of high gamma sandstone and radioactivity size have positive correlation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105257284A (en) * | 2015-09-23 | 2016-01-20 | 中国石油天然气股份有限公司 | Method and device for determining content of coagulated ash by utilizing element capture energy spectrum logging |
| CN114961708A (en) * | 2021-02-18 | 2022-08-30 | 中国石油化工股份有限公司 | Coal measure stratum organic carbon content evaluation method and device and electronic equipment |
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| CN105257284A (en) * | 2015-09-23 | 2016-01-20 | 中国石油天然气股份有限公司 | Method and device for determining content of coagulated ash by utilizing element capture energy spectrum logging |
| CN105257284B (en) * | 2015-09-23 | 2018-09-04 | 中国石油天然气股份有限公司 | Method and device for determining content of coagulated ash by utilizing element capture energy spectrum logging |
| CN114961708A (en) * | 2021-02-18 | 2022-08-30 | 中国石油化工股份有限公司 | Coal measure stratum organic carbon content evaluation method and device and electronic equipment |
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Effective date of registration: 20170228 Address after: Taibai Road Shaanxi Beilin District 710018 city of Xi'an province No. 229 Applicant after: Northwest University Address before: 710018 Xi'an Taibai Road, Shaanxi, No. 229 Applicant before: Liu Yiqun Applicant before: Zheng Qinghua |
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Application publication date: 20150610 |