肃宁油田沙一段—东三段沉积特征与成藏模式

肃宁油田下第三系沙一上亚段和东三段是主要出油井段,经过30余年的勘探开发,不断有新井获得油气显示,但是目前井控程度较低,开采效果不理想.为研究开发效果影响因素,特别是沉积特征和成藏规律,以井震结合为手段,在等时地层格架内部研究沉积储层的分布规律,总结成藏模式.研究成果表明,肃宁油田东三段沉积相是浅水三角洲前缘沉积,沙一...

Sedimentary characteristics and accumulation model of Es1 and Ed3 in Suning Oilfield

Suning Oilfield′s Lower Tertiary Sha-1 upper sub-member and Dong-3 member are the main oil-producing well sections.After more than 30 years of exploration and development，new wells have continuously obtained oil and gas displays.However，the current well control degree is low and the production effect is not satisfactory.In order to study the influencing factors of the development effect，especially the sedimentary characteristics and the law of accumulation，the combination of well-seismic as a method has been used to study the distribution law of sedimentary reservoirs within the isochronous stratigraphic framework and summarize the accumulation model.The research results showed that the sedimentary facies of the third member of the East Member of Suning Oilfield are shallow-water delta front deposits，the upper part of Shahejie Formation is a lacustrine-normal delta front deposit，and the reservoir type is a structural-lithological reservoir.The accumulation model of Suning Oilfield is a structural-lithological reservoir with lower generation and upper storage，and it does not have a unified oil-water interface.There are three superior conditions for oil and gas accumulation in an oil field，namely，sufficient oil source conditions，good drainage systems，and superior preservation conditions.Near the fault，especially in the descending wall of the reverse normal fault，the fault plays an important role in the migration of oil and gas and plays a sealing effect on the preservation of oil and gas.This result has played a positive reference to the development of the research area.