应用电成像测井识别鄂尔多斯盆地薄互层砂泥岩  

Identification of Thin Interbedded Sand and Shale with Electrical Imaging Logging in Ordos Basin

作　　者：陈康[1,2] 闫建平 赵振宇[4] 付玲 耿斌[5] 李兴文 CHEN Kang;YAN Jianping;ZHAO Zhenyu;FU Ling;GENG Bin;LI Xingwen(State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University,Chengdu,Sichuan 610500, China;School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan, Hubei 430074, China;PetroChina Research Institute of Petroleum Exploration & Development, Beijing, 100083, China;Institute of Exploration and Development, Shengli Oilfield, SINOPEC, Dongying, Shandong 257015, China;Changqing Branch, China Petroleum Logging CO. LTD., Xi’an, Shaanxi 710201, China)

机构地区：[1]油气藏地质及开发工程国家重点实验室(西南石油大学),四川成都610500 [2]西南石油大学地球科学与技术学院,四川成都610500 [3]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [4]中国石油勘探开发研究院,北京100083 [5]中石化胜利油田勘探开发研究院,山东东营257015 [6]中国石油集团测井有限公司长庆分公司,陕西西安710201

出　　处：《测井技术》2020年第6期576-583,共8页Well Logging Technology

基　　金：国家科技重大专项课题“致密油有效储层表征技术”(2017ZX05072-002);中国石油-西南石油大学创新联合体科技合作项目“川南深层与昭通中浅层海相页岩气规模效益开发关键技术研究”(2020CX020000);高等学校学科创新引智计划(111计划)“深层海相页岩气高效开发学科创新引智基地”(D18016);构造与油气资源教育部重点实验室开放基金“湖相页岩油储层微-纳米孔隙结构及有效性测井解释方法”(TPR-2018-08)。

摘　　要：鄂尔多斯盆地西北缘上古生界石盒子组盒8段与山西组致密砂岩气藏中发育大量薄互层砂泥岩,此外,还发育少量煤层。薄互层砂泥岩岩性变化快,孔隙结构复杂,储集性能差异大,具有较强的非均质性,薄互层岩性精细识别难度大,资源量评价往往漏掉薄层砂岩的潜力。利用岩心描述、物性测试及常规测井与全井眼微电阻率扫描成像测井等资料,通过岩心刻度测井信息,开展石盒子组盒8段与山西组地层中不同岩性的常规测井与全井眼微电阻率扫描成像测井响应特征分析。优选出对岩性反映较敏感的自然伽马、声波时差和铀测井曲线,建立测井曲线交会图版进行岩性识别。结果表明,交会图版对厚层(≥1 m)砂泥岩及煤层岩性有较好识别效果,对薄层(<1 m)岩性识别效果较差。利用全井眼微电阻率扫描成像测井高分辨率优势对薄层测井响应进行标定,总结薄层砂岩、泥岩的发育规律。结果表明,薄层砂岩通常夹于泥岩之间,自然伽马具有高背景下低回返、三孔隙度曲线略向右偏移、双侧向电阻率具有低背景下的高回返响应模式。将岩性识别图版和薄层岩性测井响应模式应用于目的层段井筒剖面,有效提高薄互层砂泥岩岩性解释精度,为鄂尔多斯盆地西北缘上古生界石盒子组盒8段、山西组储层与烃源岩精细评价提供依据。Large amounts of thin interbedded sand and shale are developed in the tight sandstone gas reservoir of He 8 member and the Shanxi formation of Upper Paleozoic of northwest margin,Ordos basin.In addition,small amounts of coal seams are developed.Lithology of the thin interbedded sandstone changes rapidly and the pore structure is complex.The reservoir has different performances and strong heterogeneity.Fine identification of the thin interbedded lithology is difficult,and the resource evaluation often misses the potential of the thin sandstone.Using core description,conventional logging and Formation Micro-scanner Image(FMI)and other data,the study analyzes the response of different lithologies in He 8 member and Shanxi formation through core calibration logging information feature.We select GR(natural gamma),AC(acoustic time)and U(uranium)logging curves that are more sensitive to lithology reflection,and establish a logging curve intersection chart for lithology identification.The results show that the intersection chart has a good recognition effect on thick layers(≥1 m)of sand,mudstone and coal seams,but a poor recognition effect on thin layers(<1 m).Using the high-resolution advantages of FMI to calibrate the thin-bed logging response,and summarize the development law of thin-bed sandstone and mudstone.The results show that thin sandstones are usually sandwiched between mudstones.Natural gamma has a low return under high background,the three porosity curves are slightly shifted to the right,and the dual lateral resistively has a high return response pattern under low background.Finally,the lithology identification chart and thin layer lithology logging response model are applied to the wellbore profile of the target layer,which effectively improves the interpretation accuracy of thin interbedded sand and mudstone,and provides a basis for the fine evaluation of the reservoir and source rock of the He 8 member and the Shanxi formation in this region.

关 键 词：薄互层砂泥岩 煤层 电成像测井 岩性识别 常规测井 鄂尔多斯盆地 

分 类 号：P631.84[天文地球—地质矿产勘探]