小林克–哈拉海断裂带萨尔图油层断层侧向封堵性分析

Analysis of Lateral Blocking of Faults in the Saertu Reservoir in Xiaolinke-Halahai Fault Zone

摘要: 小林克–哈拉海断裂带在萨尔图油层已经钻获油流，但对该地区断层封堵性研究尚未深入。为了揭示研究区内该断块圈闭的有效性，根据该地区断层断距和最大单砂体厚度分布和基于断面SGR下限法评价该区的断层侧向封堵性。研究得到小林克–哈拉海断裂带在S₀、S₁和S₃油层组断层侧向封闭类型均为断层岩封闭，而在S₂油层组内断层侧向封闭类型以断层岩封闭为主，夹杂少量岩性对接封闭。根据小林克–哈拉海断裂带各萨尔图油层组的断层侧向弱、中等、强封闭区域油气下限，定量评价得到研究区断层多呈现出中等侧向封闭能力，S₃油层组发育的弱封闭能力断层条数最多，S₄、S₂油层组次之，S₁油层组最少仅发育1条；在S₀和S₁油层组内中部地区发育少量强封闭能力断层。

Abstract: The Xiaolinke-Halahai fault zone has been drilled oil flow in the Saertu oil layer, but the research on the fault sealability in this area has not been in-depth. In order to reveal the effectiveness of the fault block trap in the study area, the lateral sealability of the fault in the area was evaluated based on the fault distance and the largest single sand body thickness distribution in the area and the SGR lower limit method. The research shows that the Xiaolinke-Halahai fault zone is closed by fault rocks in the S₀, S₁ and S₃ oil layer groups, while the fault rocks in the S₂ oil layer group are mainly closed by fault rocks, and a small amount of lithology is butt closed; according to the oil and gas lower limit of weak, medium, and strong lateral faults in the Saertu reservoirs of the Xiaolinke-Halahai fault zone, the quantitative evaluation shows that most of the faults in the study area show moderate lateral sealing capacity, the S₃ oil layer group has the largest number of faults with weak sealing capacity, the number of faults developed in the S₄ and S₂ oil layer groups is the second, the number of faults with weak sealing capacity developed in S₁ oil layer group is the least and the only one; a small number of faults with strong sealing capacity are developed in the central area of the S₀ and S₁ reservoir groups.