高青地区沙三段砂体成因与油气成藏分析

高青地区位于济阳坳陷东营凹陷西南部的博兴洼陷西部地区 ,油气成藏主要受三角洲砂体分布控制。以沉积体系发育研究为指导 ,以地震相分析和测井约束反演技术为主要手段 ,分析高青地区沙三段沉积演化史 ,认为其沙三段砂体 (包括已发现的樊家砂体、高青砂体、正理庄砂体 )是高青三角洲 (物源来自洼陷西部青城凸起及西北更远地区 )不同发育时期的产物 ,成分成熟度都比较低。描述了高青地区沙三段砂体分布特征及储集层性质 ,指出沙三下亚段油藏以砂体上倾尖灭的构造 岩性油藏为主 ,沙三中亚段油藏以三角洲前缘的滑塌浊积岩的岩性油藏为主 ,沙三上亚段油藏以三角洲前缘的构造 岩性油藏为主。高青地区进一步勘探的要点是落实岩性圈闭和构造 岩性圈闭的分布 ,同时考虑断层封闭性。图 2 (王孝陵摘 )

An analysis of the genesis of sand bodies and oil/gas reservoir forming in Member S3 of Gaoqing area

Gaoqing area is located at the western part of Boxing sag which is in southwest of Dongying sag, Jiyang depression. Oil and gas reservoirs are controlled mainly by the distribution of deltaic sand bodies. Directed by the sand body development study, and using seismic phase analysis and constrained inversion of well logging record techniques as main measures, an analysis of the evolution history of deposition of Member S 3 in Gaoqing area reveals that sand bodies in Member S 3 in Gaoqing area (including already discovered Fanjia sand body, Gaoqing sand body and Zhenglizhuang sand body) is the evolutional results of Gaoqing delta (material sources come from Qingcheng area, and some places more far to the northwest) with fairly low matured materials. Distribution characteristics as well as petrophysical properties of the reservoir formation are described. It points out that up-dip pitchout structural-lithological reservoirs are the main reservoir type in Lower S 3 submember; delta front slump turbidite stratigraphic reservoirs are the main oil reservoir type in Middle S 3 submember; and delta front structural-lithological oil reservoir is the main reservoir type in Upper S 3 submember. The next important point in the exploration of Gaoqing area is to make the distribution of lithological traps as well structural-lithological traps more clear, and the sealing property of the fault systems should be considered simultaneously.