南堡凹陷地层压力演化及成因  

Evolution and Formation Mechanism of Pressure in the Nanpu Sag

作　　者：孟令箭[1] 吴建楠[2] 汤建荣[2] 曹强[2] 夏秋君[1] 刘海青[1] 吴琳娜[1] 龚发雄[1] 李雪芹[1] Meng Lingjian Wu Jiannan Tang Jianrong Cao Qiang Xia Qiujun Liu Haiqing Wu Linna Gong Faxiong Li Xueqin(Research Institute for Exploration and Development, PetroChina Jidong Oilfield Company, Tangshan Hebei 063004, China Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China)

机构地区：[1]中国石油冀东油田勘探开发研究院,河北唐山063004 [2]中国地质大学(武汉)资源学院,武汉430074

出　　处：《地质科技情报》2016年第5期110-117,共8页Geological Science and Technology Information

基　　金：中国石油冀东油田公司横向协作项目"南堡凹陷超压演化及其对岩性油气藏的成藏控制作用研究"(2013026444);中国地质大学(武汉)构造与油气资源教育部重点实验室开放基金(TPR-2011-33);国家科技重大专项"渤海湾盆地精细勘探关键技术"-课题6"南堡凹陷油气富集规律与增储领域"(2011ZX05006-06)

摘　　要：压力场分布决定了油气运移的指向和分布状态,地层压力演化成果可为研究区有利成藏区带评价提供科学决策依据。基于钻井测试资料和地震资料,利用盆地模拟技术对南堡凹陷地层压力演化史进行了研究。研究表明,南堡凹陷地层压力演化经历了沙河街组-东营组沉积期（45.5～24.3Ma）及馆陶组沉积期-现今（24.3～0Ma）的一幕半＂增压-泄压＂旋回,压力演化表现为＂积累-停滞-再积累＂的总体特征,超压主体位于生烃凹陷,盆地中-东部剩余压力极大值高于西部,且主要赋存于沙河街组及东营组三段。南堡凹陷东营组末构造抬升剥蚀导致在24.8～14.8 Ma超压表现为停滞增长,且不同＂增压＂旋回沙河街组及东营组超压成因机制各异,第一个＂增压＂旋回（45.5～24.8 Ma）沙河街组增压幅度远高于东营组,沙河街组超压主要为欠压实及生烃增压双重贡献,东营组超压主要为欠压实成因;第二个＂增压＂旋回（14.3～0 Ma）沙河街组与东营组增压幅度相近,沙河街组和东营组超压皆为生烃增压成因。Pressure field distribution determines the orientation of migration and state of distribution of oil and gas,and formation pressure evolution results can provide scientific decision basis for assessment of favorable reservoir forming play.Based on the well tests and seismic data,the basin modeling technique is adopted to reconstruct the excess pressure evolution history in the Nanpu Sag.On the basis of our investigations,the following conclusions have been drawn.One and a half episodic accumulation and release of pressure occurred in the Nanpu Sag,which happened in the depositional stage of Shahejie-Dongying Formations（45.5-24.3 Ma）and Guantao Formation-Quaternary（24.3-0 Ma）.The overpressure is horizontally distributed in the hydrocarbon kitchen and the central-eastern basin has higher excess pressure than western area.Vertically,the overpressure is mainly located at Es and Ed3 Formations.The tiny release and increase of pressure during 24.8-14.8 Ma,may result from the tectonic movements that occurred during the Late depositional stage of Dongying Formation.Different overpressure mechanisms are found in the two episodic accumulations of pressure.In the first episodic accumulation of pressure（45.5-24.8Ma）,the higher excess pressure in the Es Formation may result from undercompaction and hydrocarbongeneration,but overpressure in the Dongying Formation is formed relatively later and mainly results from hydrocarbon generation.In the second episodic accumulation of pressure（14.3-0 Ma）,the excess pressure increases are nearly the same and both are related to hydrocarbon generation.

关 键 词：南堡凹陷 超压演化 压力模拟 增压-泄压 

分 类 号：TE122.23[石油与天然气工程—油气勘探]