| 渝东南地区龙马溪组构造应力场数值模拟及裂缝有利区预测 |
| |
| 引用本文： | 李萧,吴礼明,王丙贤,胡秋媛,董大伟.渝东南地区龙马溪组构造应力场数值模拟及裂缝有利区预测[J].地质科技通报,2021,40(6):24-31. |
| |
| 作者姓名： | 李萧 吴礼明 王丙贤 胡秋媛 董大伟 |
| |
| 基金项目： | 国家自然科学基金项目42072162 |
| |
| 摘 要： | 渝东南地区页岩储层发育，以下志留统龙马溪组为主力储层。此类页岩储层以构造裂缝发育为主要特征，是控制研究区油气运移与富集的主要因素。对渝东南地区龙马溪组的裂缝进行预测，可为研究区下一步勘探开发提供重要依据。以野外地质踏勘为基本方法，选取区内典型剖面，对渝东南地区的构造特征进行系统分析；在此基础上，针对研究区龙马溪组页岩储层建立地质模型，利用有限元分析软件ANSYS15.0进行构造应力场数值模拟。以构造应力场数值模拟结果为依据，进一步综合页岩储层的多个影响因素，引入"裂缝综合发育系数IF"，定量表征与预测页岩储层的裂缝分布与发育程度。结果表明，裂缝综合发育系数IF越大，页岩储层裂缝越发育。依此将渝东南地区龙马溪组页岩储层划分为Ⅰ类裂缝有利区带（IF ≥ 3.0，裂缝发育）、Ⅱ类裂缝有利区带（（3.0，2.0]，裂缝较发育）和Ⅲ类裂缝有利区带（2.0，1.0]。构造应力场数值模拟结果恢复再现了喜马拉雅时期的构造应力场，与实际地质构造取得了较高的吻合度。
|
| 关 键 词： | 龙马溪组 渝东南 构造应力场 裂缝预测 数值模拟 |
| 收稿时间： | 2021-05-06 |
Numerical simulation of tectonic stress field and prediction of fracture target in the Longmaxi Formation,southeastern Chongqing |
| |
| Abstract: | Shale reservoirs are well developed in Southeast Chongqing, of which the Longmaxi Formation is the main reservoir.Compared with other types of reservoirs, structural fractures are very well developed in this type of shale reservoirs, making this area potential for shale exploration.In this paper, based on the field survey data and typical regional geological sections, structural characteristics of the study area were analyzed.On this basis, a geological model for the shale reservoir was established.In order to restore the process of structural evolution within the study area of the Himalayan period, further, the finite element analysis software Ansys 15.0 are used.Simulation results fit the actual structural development well.Based on the results as well as Griffith fracture criterion and Coulomb-Moore fracture criterion, multiple influencing factors of shale reservoirs were comprehensively analyzed, and comprehensive fracture development coefficient IF were used to quantification of the fractures distribution prediction in shale reservoirs.The larger comprehensive fracture development coefficient IF is, the more developed the shale reservoir fractures would be.Therefore, shale reservoirs in the study area are classified into three categories: fracture favorable zone Type Ⅰ(IF ≥ 3.0, fracture very well developed), fracture favorable zone Type Ⅱ(3.0, 2.0], fracture good developed) and fracture favorable zone Type Ⅲ(2.0, 1.0]. |
| |
| Keywords: | |
|
| 点击此处可从《地质科技通报》浏览原始摘要信息 |
|
点击此处可从《地质科技通报》下载全文 |
|
