滨里海盆地东缘B油田石炭系KT-Ⅰ层早成岩期岩溶特征及成岩相类型  

Eogenetic karst characteristics and diagenetic facies types of Carboniferous KT-I layerin B Oilfield, eastern margin of Pre-Caspian Basin

作　　者：吕斌 李凌[1,2] 卢家希 王淑琴 陈烨菲[3] 谭秀成[1,2] LÜBin;LI Ling;LU Jiaxi;WANG Shuqin;CHEN Yefei;TAN Xiucheng(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;CNPC Key Laboratory of Carbonate Reservoirs Southwest Petroleum University Division,Chengdu 610500,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油天然气集团有限公司碳酸盐岩储层重点实验室西南石油大学研究分室,四川成都610500 [3]中国石油勘探开发研究院,北京100083

出　　处：《天然气地球科学》2024年第6期1031-1043,共13页Natural Gas Geoscience

基　　金：中国石油集团公司“十四五”前瞻性基础性科技项目(编号:2022DJ3209)资助。

摘　　要：为明确滨里海盆地东缘B油田石炭系KT-Ⅰ层岩溶特征及成岩相分布规律,综合应用钻井岩心、铸体薄片、常规物性分析及测井资料,得出以下结论:(1)研究区KT-Ⅰ层明显受到早成岩期岩溶改造,岩溶旋回与沉积旋回密切相关,并控制储层的分布,优质储层主要发育于岩溶旋回中上部的颗粒滩和云坪中;(2)研究区KT-Ⅰ层的成岩相可划分为7种,分别为:早期强溶蚀相、早期中等溶蚀相、早期弱溶蚀相、早期云化强溶蚀相、早期云化中等溶蚀相、胶结相和压实相,其中除胶结相和压实相为破坏性成岩相外,其余都为建设性成岩相;(3)研究区中部和北东部A2与A3小层的颗粒滩和云坪是建设性成岩相带发育的区域,是KT-Ⅰ层勘探开发的首选区域。上述认识对B油田储层发育机制研究及后期勘探开发具有一定的理论和实践意义。In order to clarify the karst characteristics and diagenetic facies distribution law of the Carboniferous KT-I layer in B Oilfield,east margin of Pre-Caspian Basin,the following conclusions are drawn from the com⁃prehensive application of drilling core,thin section,conventional physical property analysis and logging data:(1)In the study area,the KT-I layer was obviously reformed by the karst in the early diagenzoic stage,and the karst cycle was closely related to the sedimentary cycle,which controlled the distribution of reservoirs.The high-quality reservoirs mainly developed in the grain beach and dolomite flat in the middle and upper part of the karst cycle.(2)The diagenetic facies of the KT-I layer in the study area can be divided into seven types,which are:eogenetic strong dissolution facies,eogenetic medium dissolution facies,eogenetic weak dissolution fa⁃cies,eogenetic dolomitization strong dissolution facies,eogenetic dolomitization medium dissolution facies,ce⁃mentation facies and compaction facies,among which,except the cementation phase and compaction phase are destructive diagenetic phases,the rest are constructive diagenetic phases.(3)The particle beach and dolomite flat of A2 and A3 small layers in the middle and northeast of the study area are the areas where constructive dia⁃genetic facies zone develops,and are the preferred areas for exploration and development of KT-I layer.These understandings have certain theoretical and practical significance for the study of reservoir development mecha⁃nism and the later exploration and development of B Oilfield.

关 键 词：早成岩期岩溶 成岩相 KT-Ⅰ层 B油田 滨里海盆地 

分 类 号：TE122.23[石油与天然气工程—油气勘探]