苏里格东区南部中石炭世古构造—古地貌恢复及对马五_(1-4)储层的控制作用

Paleostructural and paleogeomorphologic reconstruction of the middle Carboniferous in southern part of eastern Sulige gas field and its effects on Ma5_(1-4) reservoir

基于前人研究成果以及大量的地层对比、沉积对比工作,采用"印模法"反演苏里格气田东区南部中石炭世古地貌、古构造特征,并研究其与马五_(1-4)储层的关系。研究区的中石炭世古构造形态是加里东期相对稳定构造活动的最终形态,能够表征其在加里东期构造演变的趋势,研究发现古构造演变对区内马五_(1-4)地层的保存具有建设作用,而残存下来的地层是形成有效储层的物质基础;中石炭世古构造、古地貌因素与区内马五_(1-4)的地层保存和岩溶作用息息相关,其空间构型对马五_(1-4)储层优劣性评价具有一定指向性。

Based on the previous research findings and a large number of stratigraphic correlation work and sedimentary comparison work,“the impression method”is adopted to restore paleogeomorphologic and paleostructural characters and study their relations with Ma51-4 reservoir. The paleostructural morphologic is the ultimate form of relatively stable tectonic movement, which explains the trend of Caledonian tectonic evolution in the study area. The results show that the paleostructural evolution has constructive effects on Ma51-4 reservoir preservation, and the surviving formation is the material basis for the effective reservoir, in addition, the carboniferous palaeostructural and paleogeomorphologic factors are closely related to the preservation and karstification of Ma51-4 reservoir, and the spatial configuration provides guidance for evaluating the quality of reservoir.