白豹油田157区长4 + 5油层组沉积相及油藏分布规律

Sedimentary Facies and Reservoir Distribution of Chang 4 + 5 Reservoir of Yanchang Formation in Block 157 of Baibao Oilfield

摘要: 白豹油田157区内主要的含油层位是长4 + 5油层组，通过分析岩性、沉积构造、测井及垂向剖面结构等沉积相标志表明，区内长4 + 5油层组为三角洲前缘亚相沉积。研究认为，长4 + 5油层组油藏的形成和分布主要受沉积相控制，为典型的岩性油藏，油气富集在水下分流河道、河口坝等有利相带中的砂体发育部位，以岩性上倾尖灭油藏为主。

Abstract: The main oil-bearing strata were Triassic Chang 4 + 5 Reservoirs in Block 157 of Baibao Oilfield. By analyzing the sedimentary facies marks such as lithology, sedimentary structures, logging data and vertical sections, it indicated that Chang 4 + 5 reservoirs in Baibao Oilfield were a delta front subface. Study shows that the formation and distribution of Chang 4 + 5 reservoirs are mainly controlled by sedimentary facies, which is a typical lithologic reservoir; oil and gas are accumulated in underwater distributary channel, mouth bar and other favorable facies for the main sand body development; and the main type of reservoir is lithologic updip pinch out reservoir.