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瓦窑堡油田中山川油区三叠系延长组长6油层是该地区的主要产层之一,由长61长62和长63三个砂岩组组成,主要产层长61可进一步划分为长611及长612两个小层。以岩心、岩石薄片、测井资料等为基础,从储层的岩石特征、孔隙结构、物性参数变化等对储层岩性的基本特征、形成的沉积环境、非均质性的表征参数等进行分析研究,结果表明长6油层储集砂体主要为水下分流河道砂体、河道砂坝砂体。长6储层为低孔隙度、特低-超低渗透率致密砂岩储层,具有较强的层间和层内非均质性。
The Chang 6 reservoir of the Triassic Yanchang Formation in the Central Sichuan-Sichuan oil-bearing area of Wayaobao Oilfield is one of the main production zones in the area. It consists of three sandstone groups consisting of Chang-61 62 and Chang-63, and the main production layer 61 can be further divided into long 611 and 612 two small layers. On the basis of core, rock slice and well logging data, the basic characteristics of reservoir lithology, the sedimentary environment formed and the characterization parameters of heterogeneity are carried out based on the rock features, pore structure and physical property parameters of reservoirs The results show that the reservoirs in Chang 6 reservoir are mainly subaqueous distributary channel sand bodies and channel sand bar bodies. Chang 6 reservoir is a low porosity, ultra-low permeability tight sandstone reservoir with strong inter-layer and intra-layer heterogeneities.