陡坡带油气藏构造特征与油气聚集规律——以渤海油田旅大6构造为例

Tectonic Characteristics and Accumulation Study in Oil and Gas Reservoirs in Steep Slope Belt-With LD6 Structure in Bohai Oil Field as an Example

张友 杨波 黄晓波 彭靖松 王飞龙

ZHANG You YANG Bo HUANG Xiaobo PENG Jingsong WANG Feilong

中海石油(中国)有限公司天津分公司渤海油田勘探开发研究院, 天津 300452

Tianjin Branch of CNOOC Ltd, Research Institute of exploration and development of Bohai Oilfield, Tianjin 300452, China

旅大6构造是渤海海域新近发现的一个中型油田。该构造位于辽东低凸起中南段陡坡带,为层状构造油气藏,垂向上多层系含油,形成典型的"阶梯式"陡坡带复式油气藏。走滑作用对构造形成、储层发育、断层封堵、油气运移都有重要的作用。构造转折端对沉积卸载形成优质储层具有重要作用,奠定了旅大6构造是辽东低凸起中南段有利成藏区的物质基础;辽中一号断层与区域走滑断层同向,具有走滑压扭性质是控圈断层侧封的关键。南北区块以及东二下段、东三段油气丰度迥异,伸展断层的运移能力和控圈断层的封堵能力共同决定了旅大6构造南区东二下段油气的差异富集成藏。

A medium-sized oilfield has been found in LD6 structure in recent years in Bohai sea. This structure is a stratified structural reservoir, located in steep slope in the center and south part of Liaodong low uplift. It has multilayer oil-bearing stratra in vertical, forming a typical stepped steep slope belt oil and gas reservoir. Strike-slip faults play an important role on the the structure forming, sandstone development, fault sealing and hydrocarbon migration of the LD6 structure. Structure transformation has an important role on sedimentary unloading and development of excellent quality sandstone reservoirs, which forms the material base of the best LD6 reservoir on the center and south Liaodong low uplift. The Liaozhong fault-1 goes along the same direction as the region strikeslip fault. The fault controlling the trap has strike-slip compressive characteristics, which is the key for fault lateral sealing. Oil and gas abundance are quite different between the North and South Block, the lower part of Dong-2 Member and Dong-3 Member. The hydrocarbon migration capability of extensional fault and sealing ability of controlling trap faults determined the differential hydrocarbon accumulation in the lower part of Dong-2 Member in South block of LD6 structure.

国家科技重大专项"渤海海域大中型油气田地质特征"(2011ZX05023-006-002)

https://doi.org/10.3969/j.issn.1008-2336.2014.03.022