摘要
廊固凹陷深潜山具有独特的地质构造背景,其空间展布可构成3个明显的构造带,即大兴断裂潜山构造带、河西务断裂潜山构造带和凤河营—侯尚村构造带。各深潜山带油气成藏静态要素空间配置存在明显差异,大兴断裂潜山构造带顶面储层可能为中元古界蓟县系雾迷山组白云岩,烃源岩及上覆盖层为优质的沙三段—沙四段泥岩,断面与不整合面为其重要的运载体系;河西务断裂潜山构造带和凤河营—侯尚村构造带顶面为石炭系—二叠系砂岩或奥陶系石灰岩储层,并发育内幕碳酸盐岩储层,前者烃源层以孔店组为主,同时可能兼有石炭系—二叠系和沙四段烃源层的部分贡献,油气输导以不整合面和断面为主;后者烃源层以优质的沙三段、沙四段烃源岩为主,桐柏镇断面是其主要的油气垂向和侧向输导通道,潜山内部不整合面对潜山内幕油气成藏十分重要。根据成藏模拟结果,各潜山构造带勘探前景存在明显差异,大兴潜山构造带为首选勘探目标。
Buried hill of Langgu Depression has a unique geological structural background. Three apparent structural belts are distributed in space-Daxing fault buried hill structural belt, Hexiwu fault buried hill structural belt and Fengheying-Houshangcun structural belt. The static elements of oil and gas accumulations in those deep buried hill are quite different in space allocation. Top reservoirs of Daxing fault buried hill structural belt are likely to be dolomite of Wumishan Formation of the Middle Proterozic Jixian System. Source rock and its cap formation are high-quality Es3 -Es4 mudstone. The cross section and unconformity surface are their important carrier systems. The tops of Hexiwu fault buried hill structural belt and Fengheying-Houshangcun structural belt are CarboniferousPermian sandstone reservoirs or Ordovician limestone reservoirs, with development of inner curtain carbonate rock reservoirs. Source rock of the former is mainly Ek formation with some Carboniferous-Permian and Es 3 and Es 4 source rock. The unconformity surface and cross section are the main oil and gas transportation channels. Source rock of the latter is quality Es 3 and Es 4 source rock. Tongbozhen cross section is the main vertical and lateral oil and gas transportation channels. Unconformity surface in the buried hill is of vital importance to oil and gas accumulation in the buried hill. The results of accumulation model indicate that the exploration prospect of those buried hill structural belts are quite different one another. Daxing buried hill structural belt is the top exploration target.
出处
《中国石油勘探》
CAS
2012年第6期53-57,7,共5页
China Petroleum Exploration
基金
中国石油天然气股份有限公司科技项目“华北探区重点勘探领域综合评价和风险目标优选”(2011D-0806)
关键词
廊固凹陷
深潜山
成藏模拟
勘探潜力
Langgu Depression, deep buried hill, accumulations model, exploration potential
