Prediction of multiscale laminae structure and reservoir quality in fine-grained sedimentary rocks:The Permian Lucaogou Formation in Jimusar Sag,Junggar Basin  

作　　者：Xiao-Jiao Pang Gui-Wen Wang Li-Chun Kuang Jin Lai Yang Gao Yi-Di Zhao Hong-Bin Li Song Wang Meng Bao Shi-Chen Liu Bing-Chang Liu 

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing,102249,China [2]College of Geosciences,China University of Petroleum(Beijing),Beijing,102249,China [3]Technology Administration Department,Petro China Company Limited,Beijing,100007,China [4]Research Institute of Exploration and Development,Xinjiang Oilfield Company,Petro China,Karamay,Xinjiang,834000,China

出　　处：《Petroleum Science》2022年第6期2549-2571,共23页石油科学（英文版）

基　　金：National Natural Science Foundation of China(Grant No.42002133,42072150);Science Foundation of China University of Petroleum,Beijing(No.2462021YXZZ003);the Strategic Cooperation Technology Projects of CNPC and CUPB(ZLZX2020-01-06)for the financial supports and permissions to publish this paper

摘　　要：Fine-grained sedimentary rocks have become a research focus as important reservoirs and source rocks for tight and shale oil and gas.Laminae development determines the accumulation and production of tight and shale oil and gas in fine-grained rocks.However,due to the resolution limit of conventional logs,it is challenging to recognize the features of centimeter-scale laminae.To close this gap,complementary studies,including core observation,thin section,X-ray diffraction(XRD),conventional log analysis,and slabs of image logs,were conducted to unravel the centimeter-scale laminae.The laminae recognition models were built using well logs.The fine-grained rocks can be divided into laminated rocks(lamina thickness of<0.01 m),layered rocks(0.01-0.1 m),and massive rocks(no layer or layer spacing of>0.1 m)according to the laminae scale from core observations.According to the mineral superposition assemblages from thin-section observations,the laminated rocks can be further divided into binary,ternary,and multiple structures.The typical mineral components,slabs,and T2spectrum distributions of various lamina types are unraveled.The core can identify the centimeter-millimeter-scale laminae,and the thin section can identify the millimeter-micrometer-scale laminae.Furthermore,they can detect mineral types and their superposition sequence.Conventional logs can identify the meter-scale layers,whereas image logs and related slabs can identify the laminae variations at millimeter-centimeter scales.Therefore,the slab of image logs combined with thin sections can identify laminae assemblage characteristics,including the thickness and vertical assemblage.The identification and classification of lamina structure of various scales on a single well can be predicted using conventional logs,image logs,and slabs combined with thin sections.The layered rocks have better reservoir quality and oil-bearing potential than the massive and laminated rocks.The laminated rocks’binary lamina is better than the ternary and multiple layers due to

关 键 词：Fine-grained sedimentary rocks Mineral composition Multiscale laminae structure Reservoir quality Image logs Lucaogou formation 

分 类 号：TE151[石油与天然气工程—油气勘探]