吐鲁番拗陷中上侏罗统储集层成岩作用研究

STUDY ON DIAGENESIS OF THE MIDDLE AND UPPER JURASSIC RESERVOIR IN TURPAN DEPRESSION

刘林玉

Liu Linyu

西北大学地质系, 西安, 710069

Department of Geology, Northwest University

笔者根据铸体薄片、扫描电镜、X-衍射和物性资料,研究了吐鲁番拗陷中上侏罗统储集层主要的成岩作用特征,认为压实作用和胶结作用是导致储集层孔隙结构变差的主要因素,溶解作用是改善储集层孔隙结构的主要因素。中侏罗统三间房-西山密组碎屑岩在溶解作用改造下具有较高的孔隙度和渗透度,成为吐鲁番拗陷重要的油气储集层。

The main diagenesis of the middle and upper Jurassic reservoirs in Turpan Depression is studied by means of the casting thin sections, scanning electron microscope, X-ray diffraction and physical properties. Compaction and cementation are the major factors turning the pore texture of reservoir worse; while dissolution is the major factor making the pore texture of reservoir better. Dissolution transformed the physical properties of reservoirs. Modified by dissolution, the clastic rock of Sanjianfang-Xishanyao Formation in the middle Jurassic became the most important reservoir of oil and gas with its high porosity and permeability in Turpan Depression.

https://doi.org/10.11781/sysydz199702173