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塔河—顺北地区走滑断裂带的通源性 及其与油气富集的关系

作    者:马庆佑, 曹自成, 蒋华山, 兰明杰
单    位:中国石化西北油田分公司勘探开发研究院
基金项目:本文受中石化重大专项“塔北下古生界油气田目标评价及勘探关键技术研究”(编号:P18095)资助
摘    要:
基于塔河、顺北油田的勘探实践,前人初步建立了走滑断裂带沟通原地下寒武统烃源岩、油气沿走滑断裂带“垂向运聚”的成藏模式,因此开展塔河—顺北地区走滑断裂带的通源性及其控藏作用研究,对下一步针对断溶体油气藏的勘探开发部署具有重要意义。基于断裂带结构、地震同相轴反射形态、振幅属性强弱等特征,并结合大量实钻井的油、气、水产能情况统计,认为通过走滑断裂与烃源层的接触关系、断裂的构造样式、活动强度等参数,可以定性评价走滑断裂带通源性。走滑断裂可直接沟通烃源岩(“有褶有断”的地震反射结构),具有花状构造的破碎带结构、长期活动的主干断裂带,则通源能力一般较强。塔河—顺北地区的走滑断裂带可初步划分为“上下多层贯通”强通源型、“下贯通上隐伏”中等通源型、“上下均未贯通”弱通源型等3种通源性结构模式,其与油气富集关系具有较好的相关性:“上下多层贯通”强通源型油气往往最富集,产能较好;“下贯通上隐伏”中等通源型油气富集程度减弱,产能差—中等;而“上下均未贯通”弱通源型油气产能通常很低甚至失利。
关键词:走滑断裂带; 构造样式; 油气垂向运移; 通源性; 油气富集; 塔河—顺北地区; 塔里木盆地

Source-connectivity of strike slip fault zone and its relationship with oil and gas accumulation in Tahe-Shunbei area, Tarim Basin

Author's Name: MA Qingyou, CAO Zicheng, JIANG Huashan, LAN Mingjie
Institution: 
Abstract:
Based on the exploration practice of Tahe and Shunbei oilfields, some scholars initially established a “vertical migration and accumulation” reservoir-forming model of strike-slip fault belts connecting the source rocks of Lower Cambrian. Therefore, it is of great significance to carry out the research on the source-connectivity of the strike slip fault zone and its control on reservoir-forming in Tahe-Shunbei area, in order to guide the next exploration and development of fault-controlled karst reservoirs. Based on the characteristics of fault zone structure, seismic event reflection pattern, amplitude attribute strength and so on, and combined with the statistics of oil, gas and water production capacity of a large number of drilling wells, it is considered that the source-connectivity of strike slip fault zone can be qualitatively evaluated by the contact relationship between strike slip fault and source rock, structural style and activity intensity of fault, and other parameters. If strike slip faults have direct contact relationship with source rocks (seismic reflection structure with fold and fault), fracture zone structure with flower structure and main fault zone with long-term activity, then the source-connecting capacity of strike slip fault is usually strong. The strike slip fault zone in Tahe-Shunbei area can be preliminarily divided into three types: strong source-connecting type of “upper and lower multi-layer connection”, medium source-connecting type of “lower connection and upper concealed” and poor source-connecting type of “upper and lower concealed”. The source-connecting type of strike slip fault zone has good correlation with oil and gas enrichment. The strong source-connecting type is often the most enriched and have better productivity; the degree of oil and gas enrichment of medium-connecting type is decreased, and the productivity is poor to medium; while the productivity of poor source-connecting type is usually very low or even lost. This recognition will play an important role in optimizing exploration targets and expanding exploration achievements of strike slip fault zone.
Keywords: strike slip fault zone; structural style; vertical migration of oil and gas; source-connectivity; oil and gas enrichment; Tahe-Shunbei area; Tarim Basin
投稿时间:2020-12-22  
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