中下扬子二叠纪礁碳酸盐岩成岩作用、孔隙演化及油气评价  

DIAGENESIS,POROSITY EVOLUTION AND PETROLEUM EVALUATION OF PERMIAN REEF CARBONATE ROCKS IN THE MIDDLE AND LOWER YANGTZE AREA

作　　者：沈安江[1] 陈子料[1] 陆俊明 

机构地区：[1]中国石油天然气总公司杭州石油地质研究所

出　　处：《地质论评》1997年第1期91-100,T002,共11页Geological Review

摘　　要：本文提出中下扬子二叠纪礁碳酸盐岩主要成岩作用类型有造礁作用、白云石化作用、胶结作用、溶解作用及裂隙作用;经历了海水、混合水、大气淡水及埋藏成岩环境;按下列序列演化:造礁作用—海水胶结作用—蒸发海水白云石化—淡水渗流带淋溶及潜流带胶结作用—混合水白云石化—浅埋Ⅰ胶结、白云化及溶解作用(T_1/P_2)的多期交替—深埋藏胶结(含J_3/J_2古表生构造岩溶作用)—深埋藏溶解—深埋藏白云石化—浅埋藏Ⅱ及表生淋溶胶结作用。在此基础上恢复成岩地质体的孔隙演化史,并以构造演化为主线,“三史”配置为核心,对礁碳酸盐岩油气勘探潜力进行评价,指出可能有二期配置关系,即印支—燕山期和喜马拉雅期的“三史”配置。Reef-building processes, dolomitization, cementation, dissolution and fracturing could be recognized from Permian reef carbonate rocks in the middle and lower Yangtze area. The Permi-an reef carbonate rocks have undergone marine diagenetic environment, evaporative marine dia-genetic environment, meteoric water-seawater mixing diagenetic environment, meteoric water di-agenetic environment and burial diagenetic environment. The diagenetic sequence of the Permian reef carbonate rocks is as follows: reef-building processes → marine cementation → evaporative marine dolomitization → dissolution in the meteoric vadose zone and cementation in the meteoric phreatic zone → meteoric water-seawater mixing dolomitization → alternation of shallow burial (I) cementation, dolomitization and dissolution (T1/P2) → deep burial cementation (including J3/J2 paleokarstification) → deep burial dissolution → deep burial dolomitization → dissolution and cementation in shallow burial (II) and supergene leaching and cementation. Based on the above studies porosity evolution of the Permian reef carbonate rocks have be reconstructed. Fur-thermore, the potential of petroleum exploration of the Permian reef carbonate rocks has been e-valuated according to the tectonic evolution and a comprehensive study of dynamic matching, which suggests that in the Indosinian-Yanshanian period and Himalaya period there might exist favorable petroleum migration, accumulation and preservation.

关 键 词：礁碳酸盐岩 孔隙演化 油气评价 成岩作用 油气藏 

分 类 号：P618.130.2[天文地球—矿床学] P588.245[天文地球—地质学]