松辽盆地三肇凹陷白垩系致密油成藏特征及主控因素  

Reservoir Forming Characteristics and Main Controlling Fac-tors of Cretaceous Tight Oil in Sanzhao sag,Songliao Basin

作　　者：康德江[1] KANG De-jiang(Exploration and Development Research Institute of Daqing Oil-field Co.,Ltd.,Daqing Heilongjiang 163712,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《西部探矿工程》2021年第9期104-107,共4页West-China Exploration Engineering

基　　金：国家科技重大专项“大型油气田及煤层气开发”(编号:2017ZX05001)。

摘　　要：松辽盆地北部扶余油层是典型的上生下储的源外致密油分布层位。通过致密油成藏地质条件分析认清,上覆青山口组泥岩作为成熟烃源岩广泛分布,丰度高、厚度大,为扶余油层致密油成藏提供了成藏物质基础;松辽盆地北部整体具有向斜构造特征,密集发育的向上仅断穿T2断裂为致密成藏提供了良好的输导通道;广泛发育的三角洲沉积体系为扶余油层提供了平面大面积发育的致密储层,但储层的物性差、连通性弱,非均质性强,根据微观特征可以分为Ⅰ类和Ⅱ类储层,Ⅰ类储层物性条件较好,孔隙度和渗透率分别大于10%和0.25mD,孔喉半径大于150nm,是最容易形成油气富集的致密储层类型;Ⅱ类储层孔隙度在10%~8%,渗透率在0.1~0.25mD,孔喉半径大于75nm。构造诱导、相带控砂、河道控储、断砂成藏四者共同作用决定致密油富集区带及甜点发育位置。Fuyu reservoir in the north of Songliao basin is a typical out of source tight oil distribution layer.Through the analysis of the geological conditions of tight oil accumulation,it is clear that the mudstone of Qingshankou Formation overlying is widely dis-tributed as mature source rock with high abundance and thickness,which provides the material basis for tight oil accumulation of Fuyu oil reservoir;the northern Songliao basin has the characteris-tics of syncline structure as a whole,and the densely developed up-ward fault only breaks through T2 fault,which provides a good channel for only accumulation;the widely developed three faults Jiaozhou sedimentary system provides Fuyu oil reservoir with a large area of compact reservoir,but the reservoir has poor physical properties,weak connectivity and strong heterogeneity.According to the micro characteristics,it can be divided into class I and class II reservoirs.The physical conditions of class I reservoir are good,porosity and permeability are greater than 10%and 0.25md respec-tively,pore throat radius is greater than 150nm,which is It is easy to form tight reservoir type with oil and gas enrichment;type II res-ervoir porosity is 10%~8%,permeability is 0.1~0.25mD,pore throat radius is greater than 75Nm.The main controlling factors of tight oil accumulation and distribution are further defined,that is,structural induction,facies zone,river channel and combination re-lationship between faults and sand bodies determines the tight oil enrichment zone and sweet spot development location.

关 键 词：松辽盆地 致密油 储层 孔喉 主控要素 

分 类 号：TE34[石油与天然气工程—油气田开发工程]