松辽盆地梨树断陷营城组一段页岩气成藏条件分析

松辽盆地梨树断陷下白垩统发育的泥页岩是页岩气成藏的有利物质基础;其中,苏家屯次洼以及桑树台洼陷东南部的营城组一段地层是含气泥页岩的有利勘探目标,目的层埋深较深,且泥页岩最大厚度超过200 m,具有有机质丰度、热演化程度较高、储集和保存条件较好的特点。通过对梨树断陷营一段的地质条件、地化条件、物性条件、保存条件及区域展布特征等几个方面来分析评价页岩气成藏条件,为该区页岩气资源的勘探提供依据。

Reservoir forming Conditions of Shale Gas in the First Member of Yingcheng Fomation of Lishu Fault, Songliao Basin

The mud shale which was developed in Lishu Fault Depression of Songliao Basin, lower cretaceous is a favorable material bases for accumulation of shale gas. The first member of Yingcheng Fm which was developed in Sujiatun Sub-depression and the southeast Sangshutai Sag is the main gas bearing mud shale target in this area. Target layer is deep and the maximum thickness of mud shale is more than 200m, and the gas bearing mud shales all have high abundance of organic matter, high thermal evolution degree and good preservation conditions. Through analysis on geological conditions, geochemical conditions, property conditions, preservation conditions and distributing feature of favorable area of K1yc1 in Lishu Fault Depression, this paper discusses the reservoir forming conditions of the shale gas, which provides a basis for further exploration of shale gas resources of this area.