摘要
廊固凹陷是冀中坳陷富油气凹陷之一,勘探程度较高,近年开展高勘探程度区的"二次勘探",已在构造勘探领域取得显著成效。以三维连片地震资料为基础,立足凹陷丰富的剩余油气资源量,开展整体地质研究,认为岩性地层勘探领域是下一步寻找整装规模储量的现实方向。凹陷沙一段—东营组沉积时期构造反转,早期沉积下倾尖灭的砂体改造为上倾尖灭,提供了形成岩性地层圈闭的构造背景;发育有东、北、西三方向物源,三角洲前缘、扇三角洲前缘、近岸水下扇等沉积砂体较为发育;存在断面、不整合面、砂体等油气输导体系;凹陷陡坡带、洼槽带和缓坡带发育有多种类型岩性地层圈闭,具有良好的成藏条件。优选了断层欠发育、构造背景简单的环桐南洼槽带翼部、大兴砾岩体以及河西务西部带,落实有利目标多个,是下一步勘探重点。
Langgu sag is one of the hydrocarbon rich sags in Jizhong Depression, with high exploration degree. ＂Secondary exploration＂ was carried out in high-exploration-degree area and remarkable results were achieved in structural exploration. It is thought that lithostratigraphic exploration is a feasible way to find next target for finding large-scale reserves, based on 3D data sets, standing on abundant residual oil and gas resources and developing integrated geologic study. Tectonic inversion occurred during the depositional period of the first member of Shahejie Formation-Dongying Formation in Langgu sag, and sand bodies of early-deposition downdip pinchout were converted to updip pinchout, providing structural setting for forming lithostratigraphic traps. Eastern, northern and western provenances developed; sedimentary sand bodies of delta front, fan delta front and nearshore subaqueous fan grew well. Hydrocarbon translocation system of fracture surface, unconformity interface and sand bodies existed in this area. Multiple lithostratigraphic traps grew on steep slope zone, trough zone and gentle slope zone, having favorable reservoir forming conditions. Multiple favorable targets were confirmed in the flank around Tongnan trough of fewer faults and simple tectonic setting, Daxing conglomerate bodies and western Hexiwu, which are the focus of further exploration.
出处
《中国石油勘探》
CAS
2013年第6期1-6,共6页
China Petroleum Exploration
关键词
廊固凹陷
岩性地层
成藏条件
二次勘探
勘探潜力
Langgu sag, lithostratigraphic, reservoir forming condition, secondary exploration, exploration potential
