港中开发区沙河街组沉积微相与油气分布
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摘要
目的 为解决港中开发区地质条件复杂,开采效果差的问题。方法 从沉积学角度,利用大量钻井的岩电组合特征和岩心观察结果,结合地震相和测井相模式,以及粒度、岩矿等分析资料,对港中开发区沙河街组湖相储层沉积微相进行了划分,并结合其沉积特征建立了沉积相模式。结果区内的储集层分为深水浊积扇、重力流水道和滩坝沉积;对各种沉积类型砂体的沉积特征、微相划分及与油气分布关系进行了探讨;滩、坝、水下河道和浊积水道砂体分布范围大,连通好,渗透率高,为区内主要储集层;各种边缘相砂体连通性、物性及其含油层动用程度均较差。结论 各种边缘相砂体是油田开发中后期重要的挖潜目标。
Aim To settle the problem that the geological condition of Gangzhong exploration area is complex,and the effect of exploitation is inferior. Methods On the basis of abundant lithologic-electric characteristic and core observation of wells drilled,and also through studying seismic and logging facies modles,and numerous data of analyses,the lacustrine reservoirs micro facies in Shahejie Formation of Gangzhong Oilfield,were divided,and sedimentary model was built by combining depositional Characteristics. Results The reservoir of the study area can be recognized as follows:Turbidity fan face,Fan delta face and Beach and Bar face,depositional characteristics of various types sandbody,microfacies division and hydrocarbon distributary relationship were take into account.It suggest that sandbody of the bar, subaqueous channel,bar edge,and turbidity channel micro faces have high porosity and permeability,extending in a large area,they are the main lacustrine reservoirs in Gangzhong area.Other micro has poor porosity and permeability,the degree of exploitation of the oil-bearing beds is low. Conclution Hence it is potential target in later period of oil exploitation.
Aim To settle the problem that the geological condition of Gangzhong exploration area is complex,and the effect of exploitation is inferior. Methods On the basis of abundant lithologic-electric characteristic and core observation of wells drilled,and also through studying seismic and logging facies modles,and numerous data of analyses,the lacustrine reservoirs micro facies in Shahejie Formation of Gangzhong Oilfield,were divided,and sedimentary model was built by combining depositional Characteristics. Results The reservoir of the study area can be recognized as follows:Turbidity fan face,Fan delta face and Beach and Bar face,depositional characteristics of various types sandbody,microfacies division and hydrocarbon distributary relationship were take into account.It suggest that sandbody of the bar, subaqueous channel,bar edge,and turbidity channel micro faces have high porosity and permeability,extending in a large area,they are the main lacustrine reservoirs in Gangzhong area.Other micro has poor porosity and permeability,the degree of exploitation of the oil-bearing beds is low. Conclution Hence it is potential target in later period of oil exploitation.
引文
[1] 王得发,张服民,孙永传,等.黄骅拗陷第三系沉积相及沉积环境[M].北京:地质出版社,1987.29 62.
[2] 冯增昭,王英华,刘焕杰,等.中国沉积学[M].北京:石油工业出版社,1994.
[2] 冯增昭,王英华,刘焕杰,等.中国沉积学[M].北京:石油工业出版社,1994.
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