古龙地区青山口组泥页岩储层裂缝发育特征及主控因素

发布时间：2018-06-03 09:43

  本文选题：页岩油 + 构造裂缝　； 参考：《东北石油大学》2017年硕士论文

【摘要】：松辽盆地古龙地区青山口组泥页岩储层构造裂缝十分发育,裂缝的发育特征研究对于本区页岩油的勘探开发具有重要意义。本文利用野外露头、岩心、薄片等资料,对泥页岩裂缝的发育类型进行了划分,分析了泥页岩裂缝的发育特征、形成机理及主控因素。利用有限元数值模拟技术的裂缝分布规律预测以及前人的研究成果,以岩心裂缝线密度等参数为主要依据,结合基于断层分布的分形几何预测方法,对泥页岩储层裂缝分布规律进行综合预测。研究区泥页岩主要发育有四种类型裂缝,包括构造裂缝、超压裂缝、成岩裂缝和滑脱缝,其中以超压促进作用形成的构造裂缝为主。走向分别为NNW-SSE向、NE-SW向、NEE-SWW向。构造裂缝的形成与分布受有机碳含量、岩石脆性指数、异常高压、断层等因素影响。区域构造演化和断裂活动分析表明该地区主要经历了三期古构造应力场作用。结合包裹体测试结果与埋藏史-热史分析数据,表明构造裂缝主要形成于青山口组末期-姚家组、嫩一二段以及明水组沉积末期。通过本区油气成藏期次和裂缝形成时间的对比,构造裂缝是重要的油气储集空间和渗流通道。构造裂缝综合预测结果表明,储层裂缝可以划分为四级发育单元,其中,Ⅰ级和Ⅱ级为裂缝发育区,高产井均位于Ⅰ级和Ⅱ级裂缝发育区内,当裂缝密度小于0.8m/m~2时,产量较低。
[Abstract]:The structural fractures of shale reservoir of Qingshankou formation in Gulong area of Songliao Basin are well developed, and the study on the development characteristics of fractures is of great significance for the exploration and development of shale oil in this area. Based on the data of outcrop, core and thin slice in the field, the development types of shale fractures are divided, and the development characteristics, formation mechanism and main controlling factors of shale fractures are analyzed in this paper. Using the finite element numerical simulation technology to predict the fracture distribution law and the previous research results, taking the core fracture linear density as the main basis, combining the fractal geometry prediction method based on the fault distribution. The fracture distribution law of shale reservoir is forecasted synthetically. There are mainly four types of fractures in the shale in the study area, including structural fractures, overpressure fractures, diagenetic fractures and slippage fractures, among which the structural fractures promoted by overpressure are the main ones. The strike is NNW-SSE direction, NE-SW direction, and NEE-SWW direction, respectively. The formation and distribution of structural fractures are affected by organic carbon content, rock brittleness index, abnormal high pressure, fault and so on. The analysis of regional tectonic evolution and fault activity shows that the area has experienced three periods of paleotectonic stress field. Combined with the results of inclusions test and burial history-thermal history analysis, it is shown that the structural fractures were mainly formed at the end of Qingshankou formation, Yao Jia formation, Nenyi and second member and the late depositional stage of Mingshui formation. Based on the comparison of the times of oil and gas accumulation and the time of fracture formation in this area, the structural fracture is an important hydrocarbon reservoir space and percolation channel. The comprehensive prediction results of structural fractures show that the reservoir fractures can be divided into four development units, among which, class 鈪，

本文编号：1972331