渤海湾盆地沾化凹陷新近系油气运移路径与富集规律

Hydrocarbon migration paths and enrichment rules of Neogene in Zhanhua Sag of Bohai Bay Basin

方旭庆

FＡＮＧ Xuqing

（中国石化胜利油田分公司勘探处，山东 东营 257001）

(Exploration Division, Shengli Oilfield Company, SINOPEC, Dongying 257001, China)

针对渤海湾盆地沾化凹陷新近系油气运移路径和分布规律复杂的问题，文中结合区域应力场特征分析不同断层输导性、应用层序观点和井筒信息分析砂岩横向输导特征，并研究了不同的运移路径及油气富集规律。结果表明，沾化凹陷新近系发育旋扭断裂式、走滑断裂式和优势砂体式3种主要运移路径。披覆构造带顺时针旋扭作用控制扭张断裂优势通道，形成高度富集的披覆构造油气富集区；北北东向走滑断裂带形成扭张走滑运移优势通道，形成Ⅰ型斜坡带构造￣岩性油气藏富集区；NgU2旋回优势岩相砂岩和馆陶组长期洪泛面泥岩组成油气横向优势通道，形成Ⅱ型斜坡带岩性油气藏富集区。

The hydrocarbon migration paths and distribution patterns of Neogene are very complex in Zhanhua Sag of Bohai Bay Basin. Studying the different fault migration with the regional stress field characteristics and horizontal transportation conditions of sandstone by using sequence stratigraphy and well hole information, this paper analyzes the hydrocarbon migration paths and enrichment rules of Neogene. The results show that there are three kinds of main migration paths, rotation-transtensional fault, strike slip fault and advantage facies sandstone. The drape structure formed highly enriched oil and gas area by dominant migration channel of rotation-transtensional fault controlled by clockwise transtensional effect. The type I slope formed oil and gas enrichment area of structural lithological reservoirs by dominant migration channel of NNE strike slip fault zone. The type II slope formed oil and gas enrichment area of lithological reservoirs by domain horizontal migration channel, which is made up of advantage facies sandstone of NgU2 cycle and long period flooding surface mudstone.

10.6056/dkyqt201603006