摘要
在油气藏类型及分布层位差异研究的基础上,采用油气分布与成藏条件对比分析的研究方法,对方正断陷东、西部的油气成藏条件及成藏模式的差异性进行了研究.结果表明：断裂类型及对油气成藏作用存在差异性,西部主要为早期形成的断裂,对油气成藏起遮挡作用,东部主要为长期发育断裂,对油气成藏起运移输导作用;断裂对盖层破坏程度存在着差异性,东部断裂对盖层的破坏程度较西部断裂高,东部油气分布层位多,西部油气分布层位少;油气运移方向和圈闭类型存在差异性,西部油气主要发生侧向运移,圈闭为断层遮挡、不整合遮挡和砂岩上倾尖灭圈闭,东部油气主要发生垂向运移,圈闭为断鼻圈闭;油气成藏模式明显不同,西部为油气侧向运移,在构造高部位的反向断层遮挡、不整合遮挡和砂岩上倾尖灭圈闭中聚集成藏,东部为油气垂向运移,在断层下盘断鼻圈闭中聚集成藏.
Abstract： On the researches of the differences of the oil-gas reservoir types and their distribution layers, by means of the contrast and analyses of the distribution and accumulating conditions, the differences of the conditions and modes between East and West Fangzheng Fault Depression are studied. The researches show that there are differ- ences in the types of the faults and their actions over the oil-gas accumulation, the western part is mainly distributed by the early formed faults that have a certain sheltering effects on the accumulation, while the east is generally cov- ered by the long-term developed faults which have the migrating and conducting effects on the oil-gas accumulation; there are differences in the damage degree of the cap rocks destroyed by the faults, the damaged degree of the east- ern cap tributed rocks are rather higher than in the east than the west; there of the west by the faults, thus conditions result in more oil-gas layers dis- are differences in both the oil-gas migration directions and types of the trap, the oil anti gas mainly laterally migrate ira the west, and the traps are mainly divided into fault Block, formnity barrier and sandslone updip pinch-out ones, while the oil-gas mainly occ, ur verlieal migration in tile east, and the traps are mainly performed as fault-nose ones; The eastern and western oil-gas accumulation modes are dis- tinctly different： for Ihe Ibrmer, the oil and gas are vertically migrated, and then accumulated in the fault-nose traps of the lower plates; for the latter, tile oil-gas lateral migration occurs, and aeeumulates in the transoid fault block, unconformity barrier and sandstone updip pinch-out traps on the higher structural positions.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2014年第4期23-28,共6页
Petroleum Geology & Oilfield Development in Daqing
基金
国家自然基金项目“油源断裂转换带优势输导运移油气条件研究”(41372153)
关键词
方正断陷
东、西部
油气成藏条件
成藏模式
差异性
Fangzheng Fault Depressionl the easlern and weslern area
condition of the oil-gas accumulation
mode of oil-gas aeeumulation
difference/differenlial
