巴彦浩特盆地及其南缘石炭系页岩气聚集条件

Accumulation conditions of the Carboniferous shale gas in Bayanhaote Basin and its southern periphery

通过巴彦浩特盆地6处野外露头的实测和采样,以及地化参数、物性参数等测试分析,研究了巴彦浩特盆地石炭系泥页岩的沉积环境、厚度及分布、有机质类型及含量、成熟度和含气量等页岩气成藏条件,认为目标泥页岩在盆地内分布广泛,厚度大,有机质含量高,有机质类型优越,热演化程度适中,具备良好的页岩气气源条件;目标泥页岩中发育孔隙和裂缝,并且等温吸附试验也表明泥页岩具有较强的气体吸附能力.依据泥页岩厚度、埋藏深度、有机碳含量、热演化等信息,预测巴参2井—巴参3井一带和红水堡—营盘水—大柳树一带为页岩气藏的有利发育区域.

The accumulation conditions of Carboniferous shale gas in the studied areas,such as sedimentary environment,thickness & distribution of the shale,and type,composition,maturity and gas saturation of kerogen,are studied based on the analysis of actual measurement,sampling,geochemical parameters and physical parameters of the outcrops from 6 places in Bayanhaote Basin. The results show that the target shale is characterized by extensive distribution,great thickness,rich organic matter,ideal kerogen type and moderate maturity. All these indicated that the target shale has good shale-gas source conditions. Besides,there are pores and fractures in the target shale,and the shale gas is of good gas adsorption ability according to the isothermal adsorption tests. Based on the analysis of shale thickness,buried depth,TOC,maturity etc.,it is held that there are 2 shale gas accumulation potential areas: one is the zone from Bacan 2 well to Bacan 3 well,the other is the zone from Hongshuibao,Yingpanshui to Daliushu.