江汉盆地泥岩压实及新沟咀组油气运移聚集条件

COMPACTION OF MUDSTONE AND OIL-GAS MIGRATION-ACCUMULATION CONDITION OF THE XINGOUZUI FORMATION IN JIANGHAN BASIN

陈荷立 江继纲 罗晓容 王凤琴

Chen Heli Jiang Jigang Luo Xiaorong Wang Fengqin

本文从分析泥岩压实曲线入手,结合考虑生油条件及其他地质条件,对江陵凹陷与潜江凹陷新沟咀组过剩压力分布特征、油气运移方向以及含油远景等问题进行了讨论。

Based on the analysis of the curves of mudstone compaction, it is ascer-tained that the smallest depth of hydrocarbon-expulsion of the Xingouzui Forma-tion in Jiangling and Qianjiang Sags of the Jianghan Basin is 2100m, and thatthe expulsion coordinated very well with hydrocarbon generation. We can seefrom the maps of palaeoburiel depth made by the resumption of eroded thick-ness and the compaction correction of strata that, most Xingouzui sourcerocks began its hydrocarbon expulsion after the deposition of the Jingsha For-mation, and that the effective source rock possessed the most extensive distribu-tion after the deposition of the fourth section of the Qiangjiang Formation. A series of excess-pressure profiles and maps have been drawn out based oncompaction curves. In accordance with the direction of hydrocarbon migration suggested by these maps and other geological conditions,the authors also eva-luated the exploration prospects of the research area.

10.11743/ogg19880308