东营凹陷东辛油田油气成藏模式

Model for hydrocarbon Accumulation of Dongxin Oil Field in the Dongying Sag

利用含油气系统方法和油气成藏系统理论,研究了东辛油田的油气成藏条件以及形成模式.指出东辛油田有利成藏条件:(1)三面临洼,油源条件得天独厚;(2)砂体多层次多类型;(3)断层圈闭发育;(4)沙一段泥岩为区域盖层.东辛地区存在两个主要成藏期,分别对应于东营组末期和馆陶组末期明化镇组时期,且以晚期成藏为主;油气先就近聚集,后在翼部断块区聚集成藏.

Dongxin oil field is a special enrichment area of oil and gas in the Dongying sag of Jiyang depression in the Bohai Bay basin, where the generation, migration and accumulation of hydrocarbon has tightly relation to stratum sedimentation, structure characteristics, faults evolution as well as high oil and gas resource. In this paper, by using systemic method of oil and gas contained and systemic theory of oil and gas reservoir generated, the forming conditions of oil and gas reservoir generated and their forming models in Dongxin oil field are studied. Indicated the advantaged forming conditions of oil and gas reservoir generated: (1) three sides closed up the depression, oil and gas resource was advantaged; (2) stratum sedimentation type was various; (3) faults and encirclements were full-fledged; (4) the mud stone of ES_1 was the region corniche. And pointed out the two main periods of migration and accumulation of oil and gas: the end phase of Dongying movement and Guantao anaphase—Minghuazheng phase, and the terminal hydrocarbon accumulation was main. Oil and gas accumulate nearly firstly, and enriched in the wing part of fracture block secondly. By systems analyzing the characteristics of oil and gas enrichment and main factors of oil and gas enrichment dominated, It is put forwarded that faults are main factors of oil and gas enrichment dominated, covering strata has effect to lengthways enrichment horizon of oil and gas.