摘要
我国南方古生界龙马溪组和筇竹寺组海相页岩埋藏较深,经历了复杂的构造改造历史,成熟度很高,这对页岩含气性具有重要的影响,改变了页岩的储集能力和含气饱和度。为查明南方海相页岩气成藏特征和富集规律,通过开展成藏演化分析、流体包裹体研究后认为,中国南方地区喜马拉雅期构造运动对页岩气的成藏具有关键影响,主要体现在地层压力系数出现异常,形成超低含水饱和度现象和超压核心区。最后,认为我国南方古老海相页岩在高成熟阶段能够形成大量的天然气,导致页岩广泛发育超低含水饱和度现象。构造抬升和超低含水饱和度导致我国南方构造相对稳定区发育超压页岩气富集区,是主要的勘探目标,在超压核心区广泛存在超压页岩气藏,控压生产方式能提高页岩气井的稳定产量。
In Southern China, the Palaeozoic marine shale is buried deep with high maturity and experienced complex tectonic reconstruction history, which greatly affects the gas-bearing property of shale, and changes the shale reservoir capacity and gas saturation. In order to identify the hydrocarbon accumulation features and enrichment rules of shale gas, this paper has conducted hydrocarbon accumulation evolution analysis and fluid inclusion researches. The results show that the Himalayan tectonic movement in southern China has a significant effect on the shale gas accumulation, which mainly reflects in abnormal formation pressure coefficient, presence of ultra-low water saturation phenomenon and overpressure core area. This paper also suggests that the ancient marine shale in South China could generate massive natural gas even in high mature stage, which results in the wide development of ultra-low water saturation phenomenon. The tectonic uplift and ultra-low water saturation cause the development of over-pressure shale gas enrichment zones in relatively stable areas, which are major exploration targets. The over-pressure shale gas reservoirs exist widely in over-pressure core area, and the pressure controlling production mode could improve stable production in shale gas wells.
出处
《非常规油气》
2014年第1期11-16,共6页
Unconventional Oil & Gas
基金
国家重大专项"页岩气勘探开发关键技术研究"(2011ZX05018-005)
973项目"中国南方海相页岩气高效开发的基础研究"(2013CB228001)
关键词
海相页岩
超低含水饱和度
超压核心区
超压页岩气藏
SouthChina marine shale, over-pressure core area, ultra-low water saturation, over-pressure reservoir
