利用油气微生物勘探技术寻找页岩气有利目标区

Discussion of microbial prospecting of shale gas for favorable target areas

利用油气微生物勘探技术,可以开展预测含油气区、油气前景分级评价、油气成藏主控因素分析等。近几年来该技术在中国12个区块应用效果良好。页岩气是一种非常规的天然气。控制页岩气富集的因素较多,如有机碳含量、有机质类型、热演化程度、页岩的孔隙与裂缝、埋深、压力等。在页岩气勘探中,原生页岩气藏较高的异常压力、气藏的隐蔽特性、页岩的孔隙与微裂缝愈发育气藏富集程度愈高等这些有利的页岩气成藏特点,均为油气微生物勘探技术充分发挥其独特优势提供了得天独厚的条件,可以更有效地反映页岩气的富集规律,进而圈定页岩气有利目标区,大大提高页岩气的勘探成功率,降低页岩气的勘探风险。

With the using of Microbial Prospecting of Oil and Gas （MPOG） many information about oil and gas can be taken such as the predication of the region, classification and assessment of the prospection, the primary controlling factors and so on. In recent years, MPOM are successfully applied to 12 oil and gas blocks in China. Shale gas is a kind of unconventional natural gas. There are many factors to control the accumulation of shale gas, such as TOC, organic matter type, Ro, porosity and permeability of the shale, etc. During the exploration of shale gas, MPOG can take advantage of the many characteristics of shale gas, for example, the high initial datum pressure of primary shale gas reservoir, the subde features, the higher accumulation of shale gas with the development of the more porosities and micro-fractures, which are more effectively to discover the accumulation of shale gas and the find favorable target areas, and furthermore, the exploration success ratio of shale gas can be greatly improved and the exploration risk can be reduced.