老爷庙地区石油地质特征与油气分布

PETROLEUM GEOLOGICAL PROPERTY AND HYDROCARBON DISTRIBUTION IN LAOYEMIAO REGION

老爷庙构造带为一滚动背斜构造带 ,发育 3个级别的断层 :(1)EWNE走向的控凹断层 ;(2 )NNENE走向的控油断层 ;(3)NWNWW走向的控圈闭断层。沙河街组三段 4～ 5亚段的深湖相泥岩及沙河街组一段至东营组三段的浅湖半深湖相泥岩为主力生油岩 ,此二套生油岩已进入成熟阶段 ,有机质类型以混合型及腐殖型为主 ,均具较高丰度 ,为较好好生油岩。辫状河道砂体、水下重力流砂体、水下分流河道砂体、河口坝砂体及深水浊积砂体为主要储集体 ,具高孔、高渗特征。油气藏的类型主要受控于裂陷盆地的伸展程度、同生断层及沉积相带。裂陷旋回控制含油气系统的分布 ,同生断层使含油面积扩大 。

Laoyemiao structural belt is a rolling anticline structural belt.Three grades of faults that developed there are:1.EW NE strike faults that controlled sag;2.NNE NE strike faults that controlled oil;3.NW NWW strike faults that controlled traps.The deep lake facies mudstone of 4～5 submembers of Sha 3 member and shallow to semi deep lake facies mudstone from Sha 1 member to the third member of the Dongying Formation are two main sets of source rocks whick have all reached maturation stage.Their organic matter is basically mixed and humic types with higher organic abundance.The reservoir bodies are braided river channel sand bodies,subaqueous gravity flow deposits,subaqueous distributary channel sandbodies,river mouth sand bars and turbidity sand bodies in deep water.The reservoirs are characterized by high porosity and high permeability.The types of hydrocarbon pools are mainly controlled by the extension of rifted basin,contemperaneous faults and sedimentary facies.Rifting cycles controlled the distribution of petroleum system,the contemperaneous faults increased hydrocarbon bearing area,and the collocation of reservoir facies determined oil and gas enrichment.