断裂向下输导油气成藏分布的主控因素  

Main controlling factors of the oil-gas accumulation distribution by the downward transportation of the faults

作　　者：袁晓飞[1] YUAN Xiaofei(Management Department of Zhou No.13 Cooperative Block,Daqing Oilfield Co Ltd,Daqing 163453,China)

机构地区：[1]大庆油田有限责任公司州13合作区块管理部,黑龙江大庆163453

出　　处：《大庆石油地质与开发》2020年第2期36-41,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油气条件研究”(41372153)。

摘　　要：为了研究含油气盆地上生下储式油气分布规律,在断裂向下输导油气所需条件及油气成藏分布特征研究的基础上,通过断裂向下输导油气成藏分布与其影响因素之间的关系分析,对断裂向下输导油气成藏分布的主控因素进行了研究。结果表明,断裂向下输导油气成藏分布的主控因素为:(1)断裂向下输导油气成藏深度主要受源岩古超压的影响,源岩古超压值越大,断裂向下输导油气深度越大,油气成藏深度越大;反之油气成藏深度越小。(2)断裂向下输导油气成藏层位主要受断裂向下输导油气侧向分流层位的影响,而断裂向下输导油气侧向分流层位又受砂体距源岩层距离的影响,距离源岩层越近的砂体层位,越有利于断裂向下输导油气聚集成藏,应是油气成藏层位。(3)断裂向下输导油气成藏平面分布范围主要受源岩古超压与断裂向下输导油气所需的最小源岩古超压相对大小的影响,二者差值越大,油气成藏平面分布范围越大;反之则越小。In order to study the oil-gas distributed laws of the upper generation and lower accumulation in an oil-gas-bearing basin,on the basis of the analyses on the necessary conditions in the fault downward hydrocarbon transportation and the distribution characteristics of the oil-gas accumulation,with the help of the relationship analysis between the distribution of hydrocarbon accumulation and its influencing factors by the fault downward transmission,the main controlling factors of the hydrocarbon accumulation distribution were studied.The results indicate that the main controlling factors of the oil-gas accumulation distribution by the fault downward transportation are shown as follows:①The accumulation depth is mainly affected by the paleo-overpressure of the source rock,the larger the paleo-overpressure value,the deeper the transported depth,the greater the depth of the oil-gas accumulation;conversely,the shallower the depth of the hydrocarbon accumulation will be.②The oil-gas accumulated horizon is mainly influenced by the lateral shunt horizon of the oil-gas accumulation,in addition,the lateral shunt horizon of the oil and gas transported downward by the faults is affected by the distance of the sandbody from the source rock,the closer the sandbody to the source rock,the more favorable for the downward transmission of the oil-gas accumulation by the fault and furthermore this kind of the horizon is prone to become the hydrocarbon accumulated reservoir.③The planar distribution of the oil-gas accumulated horizon by the fault downward transportation is mainly affected by the differential between the paleo-overpressure value of the source rock and the minimal paleo-overpressure value of the source rock required by fault downward transportation,the larger the difference is,the larger the planar distribution range of the hydrocarbon accumulation will be;the converse is smaller.

关 键 词：断裂 向下输导 油气成藏 分布 主控因素 

分 类 号：TE122.1[石油与天然气工程—油气勘探]