高过成熟页岩储层演化特征与成因

发布时间：2019-06-05 12:59

【摘要】：高过成熟是中国南方下古生界海相富有机质页岩储层的重要特征之一,它经历了近乎完整的热演化过程,产出大量油气和有机质孔隙。页岩有机质孔隙实际上包括干酪根孔隙、固体沥青/焦沥青孔隙。依据成岩序列、油气充注、有机质和孔隙的形态特征,识别出固体沥青或焦沥青次生孔隙,并通过典型案例构成的成熟序列,分析影响储层孔隙度与有机质丰度之间关系的主要因素,探究热演化进程中页岩展示出的诸多变化特征与成因,如天然气碳同位素由部分反转进入完全反转区、孔隙表面水润湿—油润湿—水润湿的动态转变、储层电阻率先上升后下降的逆转现象以及岩石各向异性参数的非线性波动,揭示中国南方下古生界页岩气储层可能的演化轨迹,展示不同成熟阶段页岩储层之间的内在变化规律。
[Abstract]:High maturity is one of the important characteristics of Lower Paleozoic marine organic shale reservoirs in southern China. It has experienced a nearly complete thermal evolution process, producing a large number of oil and gas and organic matter pores. Shale organic pores actually include kerogen pores, solid asphalt / coke pitch pores. According to the diagenetic sequence, oil and gas filling, organic matter and pore morphological characteristics, the secondary pores of solid asphalt or tar pitch are identified, and the mature sequences formed by typical cases are identified. The main factors affecting the relationship between reservoir porosity and organic matter abundance are analyzed, and many variation characteristics and genesis of shale in the process of thermal evolution are explored, such as the partial inversion of natural gas carbon isotopes into the complete inversion zone. The dynamic transformation of pore surface water wetting, oil wetting and water wetting, the reversal phenomenon of reservoir resistance rising first and then falling, and the nonlinear fluctuation of rock anisotropy parameters reveal the possible evolution track of Lower Paleozoic shale gas reservoir in southern China. The internal variation law between shale reservoirs in different mature stages is shown.
【作者单位】：中国石油勘探开发研究院;中国石油西南油气田分公司;
【基金】：国家重点基础研究发展计划(“973”)项目(编号:2013CB228001) 国家科技重大专项“页岩气重点地区资源评价”(编号:2011ZX05018-001)联合资助
【分类号】：P618.13

【相似文献】