北塘凹陷塘沽—新村地区古近系异常高压特征及其石油地质意义  

Petroleum geological role of Paleogene overpressure reservoirs in Tanggu-Xincun of Beitang Sag,Bohai Bay Basin

作　　者：邓荣敬[1] 徐备[1] 漆家福[2] 肖敦清[3] 韦阿娟[3] 王东林[3] 李建英 

机构地区：[1]北京大学地球与空间科学学院 [2]中国石油大学(北京) [3]中国石油大港油田公司研究中心 [4]东方地球物理公司研究院大港分院

出　　处：《石油勘探与开发》2005年第6期46-51,共6页Petroleum Exploration and Development

基　　金：国家教育部博士点基金项目(20020001055)

摘　　要：渤海湾盆地黄骅坳陷北塘凹陷塘沽—新村地区古近系存在欠压实导致的异常高压。根据声波时差和试油静压资料,塘沽—新村地区古近系普遍发育2个欠压实带,下部欠压实幅度明显高于上部欠压实幅度,异常高压油藏主要分布在3500m以下深度的沙三段深层中。油藏压力系数平面分布与沉积相带和断层的活动性有关。不均衡压实和生烃作用是形成该区古近系异常高压的主要原因。异常高压抑制烃源岩演化,促进油气初次运移,有利于原生孔隙保存,促进深层裂缝形成,提高原油产量,控制油气藏平面分布,异常高压泥岩对下伏储集层起良好封盖作用。Based on well acoustic and static pressure data, two disequilibrium compaction zones are defined vertically in the Paleogene of the Tanggu-Xincun region, Beitang Sag, with the uncompaction of the lower one stronger than that of the upper one. The overpressure reservoirs are developed beneath 3500m and their planar distribution is mainly in the east of Tanggu structure belt and the low relief of Xincun structure belt. The reservoirs ＇ pressure coefficients are associated with the sedimentary facies and fault activities. Disequilibrium compaction and the generation of oil and gas triggered abnormal high pressure in the study area, which retarted source rock thermal evolution, prompted oil and gas migration, conduced to the preservation of reservoir primary porosity and the formation of deep fractures, and improve the well production. The overpressure mudstone could be a good cap rock.

关 键 词：黄骅坳陷 北塘凹陷 古近系 异常高压特征 成因 

分 类 号：TE122[石油与天然气工程—油气勘探]