摘要
在准噶尔盆地玛北斜坡区17口取心井岩心描述基础上,以泥杂基含量、粒径为主界定参数,将该区三叠系百口泉组扇三角洲岩石相划分为5种类型。结合沉积微相分析,据岩心分析化验资料,对扇三角洲内部储层特征及分布进行研究。结果表明,玛北斜坡区百口泉组储层孔隙类型以剩余粒间孔和粒内溶孔为主,碎屑结构(粒度、泥质含量、分选、排列方式等)为储层质量差异的主控因素。储层物性主要受控于沉积微相,前缘近岸水下河道、河口坝物性最好,前缘远岸河道、平原辫状河道物性较差,平原、前缘局部发育的砂质碎屑流物性最差。相同微相中泥杂基含量高低与物性好坏相关。岩石相的划分解决了传统微相划分不能区别其中优劣储层问题。相同微相中贫泥岩石相、含泥岩石相、富泥岩石相物性依次变差,贫泥砂岩相与贫泥砂砾岩相物性相当,含泥岩石相中含泥砂岩相物性明显好于含泥砂砾岩相。
In order to point out the direction of reservoir classification and identification,provide geological basis for reservoir development,we recognize 5 types of lithofacies in the fan delta of the Baikouquan Formation in Triassic,according to argillaceous matrix content and grainsize typically, on the basis of core description of 17 wells in the Mabei slope area of Junggar Basin.Combining with sedimentary microfaciesanalysis,we study the quality differences and distribution of reservoirs within the fan delta by using core analysis and testing data.The porespace of the Baikouquan Formation is dominated by residual intergranular pore and intragranular dissolved pore.Depositional fabric(grain size,argillaceous matrix content,sorting,the mode of arrangement etc) controls the reservoir quality in the Mabei slope area.The reservoir physicalproperty is mainly controlled by the sedimentary microfacies.The physical property of front coastal channel and channel mouth bar microfaciesare the highest, followed by front far channels. and plain braided channel microfacies, and the worst are sandy debris flows in the plainand front of the fan delta.In the same microfacies,the relationship between high or low of the argillaceous matrix content and good or bad ofthe physical property is obvious. Dividing lithofacies can solve the simple traditional microfacies problem which can not distinguish good reservoirfrom bad reservoir.In the same sedimentary microfacies,the physical property of poor mud,mud and rich mud lithofacies are ordinallyturn worse. The physical property of poor mud sandtone lithofacies and poor mud conglomerate lithofacies are equivalent. The physical propertyof the sandstone is better than the conglomerate in mud lithofacies.
出处
《新疆地质》
CAS
CSCD
2016年第2期250-256,共7页
Xinjiang Geology
基金
国家重大专项低品位储量资源有效开发技术研究(2012E-34-08)资助