沁水盆地南部地区古构造恢复及其油气意义

发布时间：2018-09-19 11:05

【摘要】：古构造的高点通常是致密气长期运移和聚集的有利低势区,古构造恢复对致密砂岩气勘探尤为重要。以沁水盆地南部地区为例,基于该地区丰富的钻井、录井、测井等资料,对该地区在燕山早期(J_1—J_2)、燕山晚期(J_3—K_1)及喜马拉雅中期(E—N)等3个关键构造演化期的古构造进行了恢复。结果表明,自晚三叠世以来,本区表现为整体隆升剥蚀,强剥蚀区沿着NE—SW方向展布。燕山运动期间古隆起具有继承性,晚二叠世地层挤压变形强烈,古构造表现出"多隆多坳"特征;喜马拉雅运动中期出现"夷平化"现象,逐渐接近现今构造特征,部分古隆起逐渐变得宽缓,构造形态表现为"背斜宽缓,向斜紧闭"。将喜马拉雅运动中期的古构造单元划分为相对隆起带、相对斜坡带及相对坳陷带。相对隆起带是下一步该区煤系致密砂岩气勘探的有利区域。
[Abstract]:The high point of paleotectonics is usually a favorable low-potential area for the long-term migration and accumulation of dense gas, and the recovery of paleotectonics is particularly important for the exploration of tight sandstone gas. Taking the southern part of Qinshui Basin as an example, based on the abundant data of drilling, logging and logging in this area, The paleotectonics in the early Yanshanian (J_1-J_2), the late Yanshanian (J_3-K_1) and the middle Himalayan (E-N) were restored. The results show that since the late Triassic, the area has been uplifted and denuded as a whole, and the strong denudation zone has been distributed along the NE-SW direction. During the Yanshanian movement, the paleouplift was inherited, the late Permian stratigraphic compression deformation was strong, the paleotectonics showed the characteristics of "multi-uplift", and the "flattening" phenomenon appeared in the middle of the Himalayan movement, which gradually approached the present tectonic features. Part of the paleouplift gradually becomes wide and gentle, and its structural form is "anticline wide and syncline closed". The paleotectonic units in the middle Himalayan movement are divided into relative uplift zone, relative slope zone and relative depression zone. The relative uplift zone is a favorable area for the exploration of tight sandstone gas in coal measures in this area.
【作者单位】：西安石油大学地球科学与工程学院;中国石油大庆油田有限责任公司第二采油厂;中国石化河南油田分公司采油二厂;
【基金】：国家自然科学基金“硬脆/塑性泥页岩微裂缝产生的岩石物理学机制基础研究”(编号:41572130) 国家“十三五”重大科技专项“四川盆地周缘海相页岩气有利区优选及重点目标评价”(编号:2017ZX05035001-007)联合资助
【分类号】：P618.13

【相似文献】