姬塬地区长8油层组层序地层格架内成岩相展布特征  

Diagenetic facies distribution in high resolution sequence stratigraphic framework of Chang 8 Oil Layers in the Jiyuan area

作　　者：赖锦[1] 王贵文[1,2] 吴大成[3] 曹江宁 张晓涛[1] 冉冶[1] 姚亚斌 张永迪 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒841000 [4]中石油测井有限公司塔里木事业部,新疆库尔勒841000

出　　处：《中国地质》2014年第5期1487-1502,共16页Geology in China

基　　金：国家科技重大专项(2011ZX05020-008);国家自然科学基金项目"致密砂岩储层成岩相测井识别方法研究"(41472115);中石油创新基金(2013D-5006-030)联合资助

摘　　要：通过岩心观察并充分利用普通薄片、铸体薄片、阴极发光、X-衍射和扫描电镜等资料,对姬塬地区长8油层组储层的成岩作用、成岩矿物、成岩阶段和成岩演化序列特征等进行了研究。根据成岩作用类型及强度、成岩矿物等将储层划分为绿泥石衬边弱溶蚀、不稳定组分溶蚀、压实致密、高岭石充填和碳酸盐胶结5种成岩相。并通过岩心薄片资料刻度测井归纳出不同成岩相在GR、AC等测井曲线及其组合上的响应特征,由此实现各单井储层成岩相的连续划分。对长8油层组层序界面和基准面旋回与成岩相展布的关系进行了研究,结果表明层序界面附近不稳定组分溶蚀相及高岭石充填相较为发育,且各井之间对比性良好,同时层序界面也控制了碳酸盐胶结;中期基准面旋回的最大湖泛面处均发育井间可对比的压实致密相,长82中期基准面下降半旋回砂体一方面易于遭受溶蚀产生次生孔,另一方面由于受沉积驻留和碎屑组分影响导致压实强度较弱,因此物性总体比长81砂体好。Lithologic characteristics, reservoir property and pore structure, diagenesis, diagenetic minerals, diagenetic environment, diagenetic stage and diagenetic evolution sequence of Member 8 reservoir of Yanchang Formation were studied by making full use of normal thin sections, casting thin sections, cathodoluminescence, X-ray diffraction, scanning electron microscopy and core data. The results show that the reservoir has experienced such diagenetic processes as compaction, cementation, corrosion and fracture, and it is now at stage A of middle diagenetic process. 5 types of diagenetic facies were recognized based on diagenesis, diagenetic minerals and their effect on the reservoir quality, namely, weak corrosion with chlorite mat; corrosion of unstable components; compaction density, kaolinite filling, and carbonate cementation. The well logging response characteristics of different types of diagenetic facies were summarized on GR, SP, DEN, AC and CNL, and thus the logging recognition model and standard of diagenetic facies could be set up. Then the diagenetic facies was matched with the high resolution sequence stratigraphic framework. The results show that the sequence boundary between the Chang 81 lowstand systems tract and Chang 82 highstand systems tract controls the dissolution of the silicate minerals, the filling of the kaolinite and the cementation of carbonate cement, which suggests that diagenetic facies as corrosion of unstable components and kaolinite filling are very common in the vicinity of the sequence boundary, and they are strongly comparable between various wells; nevertheless, the carbonate cementation is also very common under the sequence boundary. The maximum flooding surface of the medium-term base level cycle corresponds to the compaction density diagenetic facies, the reservoir quality of Chang 8_2 highstand systems tract （the middle-term base-levers ascending semi- cycle） is better than that of Chang 8_1 lowstand systems tract （the middle-term base-level＇s falling semi-cycle） d

关 键 词：层序地层 成岩相 层序边界 体系域 长8油层组 姬塬地区 

分 类 号：P618.13[天文地球—矿床学] P58[天文地球—地质学]