摘要
砂岩透镜体成藏须经历供烃门限和聚烃门限 ,供烃门限与源岩向砂体排烃的临界地质条件相对应。在济阳坳陷目前已发现的 114个主要砂岩透镜体油藏中 ,有 112个处于排烃门限 ( 2 5 0 0m )以下。聚烃门限系指砂岩透镜体接收外来油气的临界地质条件 ,与之对应的砂岩孔隙度为 12 % ,渗透率为 1× 10 -3 μm2 。在济阳坳陷已发现的主要透镜体油藏中 ,98%以上的油藏平均孔隙度和渗透率超过以上临界值。在砂岩透镜体埋藏过程中 ,一般要经历 4个阶段 ,处在第三阶段的透镜体砂岩既满足源岩供烃条件 ,又满足自身的聚烃条件 ,最有利于形成岩性油气藏。
Sand lens reservoir was formed on premise of being up to hydrocarbon supply thresholds and hydrocarbon accumulation thresholds.The hydrocarbon supply threshold is corresponding to the critical geologic conditions for expulsion hydrocarbon of source rock to sand body.There have been proven 112 reservoirs with the buried depth greater than 2500m among 114 main sand lens reservoirs in the Jiyang Depression.The accumulation hydrocarbon threshold is the critical geologic condition,on which sand lens accepted hydrocarbon from source rock,corresponding to the porosity of 12 percent as well as the permeability of 0.001μm 2 in the Jiyang Depression.The porosity and permeability of more than 98 percent of reservoirs got up to or exceeded the critical value among the main proven sand lens reservoirs.Generally,there were four stages for sand lens to go through during the burial process.The sand lens to accumulation in the third stage was the most profitable to meet both hydrocarbon supply conditions of source rock and its own hydrocarbon accumulation conditions.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2003年第3期38-41,45,共5页
Acta Petrolei Sinica
基金
国家自然科学基金项目 (No.40 1 72 0 57)资助
关键词
济阳坳陷
透镜体油藏
地质门限
成藏机理
Jiyang Depression
sand lens reservoir
geological threshold
accumulation mechanism
