沁水盆地与鄂尔多斯盆地上古生界致密气成藏条件类比及勘探潜力

发布时间：2018-06-13 04:00

本文选题：沁水盆地 + 上古生界　；参考：《煤炭学报》2016年01期

【摘要】：为了探讨沁水盆地上古生界致密气的勘探潜力,采用类比分析的方法,系统分析了沁水盆地与鄂尔多斯盆地的构造-沉积演化、源储条件及成藏规律的差异性。研究表明:(1)沁水盆地与鄂尔多斯盆地共同经历了构造稳定期、构造分异期和构造定型期,二者在石炭—二叠纪具有相似的沉积演化过程,主要以海陆过渡相和陆相沉积为主。(2)沁水盆地上古生界煤层总厚度介于3~17 m,与鄂尔多斯盆地相当,镜质体反射率介于2.0%~4.5%,热演化程度高于鄂尔多斯盆地,生烃强度更大。(3)鄂尔多斯盆地致密气主要目的层为太原组、山西组和下石盒子组,次为上石盒子组和石千峰组;沁水盆地103口井测井解释结果显示,太原组和上石盒子组可疑致密气层较多,共计72层,占总数的64.9%,次为山西组和下石盒子组。(4)沁水盆地上古生界致密气具有初次运移和二次运移成藏两种模式,保存条件是成藏的关键因素,盆地中南部的向斜核部、断裂不发育的翼部是勘探的有利区。
[Abstract]:In order to explore the exploration potential of tight gas in upper Paleozoic in Qinshui Basin, the differences of tectonic-sedimentary evolution, source reservoir conditions and reservoir forming laws between Qinshui Basin and Ordos Basin are systematically analyzed by analogy analysis. The study shows that the Qinshui basin and the Ordos basin have undergone tectonic stability period, tectonic differentiation period and tectonic setting stage, and they have similar sedimentary evolution process in the Carboniferous and Permian. The total thickness of upper Paleozoic coal seam in Qinshui basin is between 3 ~ 17 m, which is equivalent to that in Ordos basin, and the vitrinite reflectance is between 2.0 and 4.5, and the thermal evolution degree is higher than that in Ordos basin. The main target layers of dense gas in Ordos Basin are Taiyuan formation, Shanxi formation and Xiashihezi formation, followed by Shangshihezi formation and Shiqianfeng formation, 103 well logging interpretation results in Qinshui Basin, Qinshui Basin. In Taiyuan formation and Shangshihezi formation, there are more suspected tight gas layers, a total of 72 layers, accounting for 64.9% of the total, followed by Shanxi formation and Xiashihezi formation. 4) the upper Paleozoic dense gas in Qinshui Basin has two modes: primary migration and secondary migration to reservoir. The preservation condition is the key factor of reservoir formation. The syncline nucleus in the central and southern part of the basin and the undeveloped wing of the fault are favorable areas for exploration.
【作者单位】：中海油研究总院新能源研究中心;
【基金】：国家科技重大专项资助项目(2011ZX05060) 中国海油科技攻关资助项目(YXKY-2015-ZY-08)
【分类号】：P618.13

【相似文献】