不同类型断-砂输导体系分布及对油气成藏的贡献  

Distributions of different-type fault-sand transporting systems and their contributions to the hydrocarbon accumulation

作　　者：武卫峰[1] WU Weifeng(CNOOC Energy Development Co Ltd.,Beijing 100027,China)

机构地区：[1]中海油能源发展股份有限公司

出　　处：《大庆石油地质与开发》2019年第3期40-45,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目“油源断裂转换带优势输导运移油气条件研究”(41372153)

摘　　要：为了研究含油气盆地内油气分布规律,在断-砂输导体系类型及输导油气特征研究的基础上,通过不同类型断-砂输导体系与断裂密集带、泥岩盖层被断裂破坏程度之间关系,结合油气分布特征,研究不同类型断-砂输导体系对油气成藏的贡献。断-砂垂向运移输导体系可分为反向、顺向和双向3种输导体系类型。反向断-砂垂向运移输导体系主要分布在背形和向形断裂密集带内,顺向断-砂垂向运移输导体系主要分布在单斜形断裂密集带外侧,双向断-砂垂向运移输导体系仅分布在背形断裂密集带外侧。断-砂侧向运移输导体系可分为同层和跨层2种输导体系类型。同层断-砂侧向运移输导体系主要分布在断盖配置封闭的断裂密集带附近,跨层断-砂侧向运移输导体系主要分布在下部断盖配置不封闭,但上部断盖配置封闭的断裂密集带附近。反向断-砂垂向运移输导体系对油气成藏贡献最大,其次是顺向断-砂垂向运移输导体系,最小是双向断-砂垂向运移输导体系。跨层断-砂侧向运移输导体系对油气成藏贡献相对较大,而同层断-砂侧向运移输导体系对油气成藏贡献相对较小。研究成果为正确认识含油气盆地油气分布规律和指导油气勘探具有重要意义。In order to study the distribute regulation of the oil and gas in a petroliferous basin, based on the researches on the types of the fault-sand transporting system and the characteristics of the oil and gas transportation, with the help of the relationships between the distribution of different-type fault-sand transporting system and the dense fault belt and damage degrees of mudstone caprock by the faults, and furthermore combined with the oil-gas distribution characteristics, the contributions of different types of the fault-sand transporting system to the hydrocarbon accumulation were studied. The vertical fault-sand transporting system can be divided into 3 types: reverse, consequent and bidirectional systems. The former is mainly distributed in the antiform and synform dense fault belts,the middle is generally distributed in the outer side of the monoclinic dense fault belt,the latter is only distributed in the outer side of the antiform dense fault belt. The lateral fault-sand transporting system can be divided into 2 types: the same layer and cross layer. The same-layer system is mainly distributed near the dense fault zone in the closed zone of the fault-caprock configuration,the cross-layer system is principally distributed near the fault dense zones where the lower fault-caprock configuration is unclosed, but the upper fault-caprock configuration is closed. The reversed fault-sand transporting system contributes most to the hydrocarbon accumulation,the next is the consequent vertical fault-sand transporting system, and the least is the bidirectional vertical fault-sand transporting system. The cross-layer lateral fault-sand transporting system contributes pretty greater to the accumulation,while the same-layer system is just on the contrary. The study results possess important significances for correctly understanding the petroleum distribution law and guiding the hydrocarbon exploration in the oil and gas basin.

关 键 词：断-砂配置 输导体系 油气分布 断裂密集带 成藏贡献 

分 类 号：TE122.1[石油与天然气工程—油气勘探]