苏干湖盆地及毗邻柴北缘西段侏罗系残留地层发育特征

发布时间：2018-01-30 20:03

本文关键词： 沉积地层地层分布构造作用侏罗系地层特征苏干湖盆地　出处：《地质力学学报》2017年03期 　论文类型：期刊论文

【摘要】：前期的油气勘探和评价揭示了柴北缘西段侏罗系具有良好的油气和煤炭勘探前景。在前人研究的基础上,利用野外露头、岩心、钻井及地震等资料,对柴北缘西段侏罗系残留地层发育特征进行了系统研究,初步落实了侏罗系残留地层的分布。侏罗系自下而上可划分为下统的湖西山组和小煤沟组,中统的大煤沟组及上统的采石岭组和红水沟组。下统主要见于冷湖构造带(湖西山组)和苏干湖盆地东部的向阳煤矿(小煤沟组)。湖西山组的下部岩性为厚层粗粒沉积物,表现为水下扇沉积特征,上部为大套湖相暗色泥岩;小煤沟组厚度较薄,沉积物粒度粗,发育煤层。中、上侏罗统主要分布于赛什腾凹陷和苏干湖盆地内的西部凹陷、中部凹陷、向阳煤矿。根据钻井显示,苏干湖盆地内中侏罗统主要发育大煤沟组五至七段,岩性主要为灰色、灰黑色泥岩夹灰色细砂岩、砾岩及薄煤层;其中五段为主力煤层和油气烃源岩层。上侏罗统岩性主要为棕红色、褐色泥岩夹砾岩、砂岩。残留地层的分布主要受控于沉积中心的迁移和断裂的展布。
[Abstract]:Previous oil and gas exploration and evaluation revealed that the Jurassic in the western part of the northern margin of Qaidam has a good prospect of oil, gas and coal exploration. Based on the previous studies, the field outcrop, core, drilling and seismic data are used. The developmental characteristics of the Jurassic residual strata in the western segment of the northern margin of Qaidam are systematically studied and the distribution of the Jurassic residual strata is preliminarily implemented. The Jurassic system can be divided into the Lower Huxishan formation and the Xiaomagou formation from the bottom to the top. The lower strata are mainly found in the Lenghu tectonic belt (Huxishan formation) and Xiangyang Coal Mine (Xiaowangou formation) in the eastern part of the Sugan Lake Basin. The lower lithology of the Huxishan formation is thick coarse grain sediment. It is characterized by underwater fan deposition, with large lacustrine facies dark mudstone in the upper part. The formation is thin in thickness, coarse in grain size and developed in coal seams. The middle and upper Jurassic are mainly distributed in the western sag, central sag and Xiangyang coal mine in Saishiteng depression and Sugan lake basin. The middle Jurassic in Sugan Lake basin is mainly developed from the 5th to 7th member of the Dagugou formation. The lithology is mainly gray, gray mudstone with gray fine sandstone, conglomerate and thin coal seam. The upper Jurassic lithology is mainly brownish red, brown mudstone intercalated conglomerate and sandstone. The distribution of residual strata is mainly controlled by the migration of sedimentary center and the distribution of faults.
【作者单位】：中国地质科学院地质力学研究所;中国石油大学(北京)地球科学学院;中国石油大学(北京)油气资源与探测国家重点实验室;
【基金】：中国地质调查局项目(12120115003501-1) 国家自然科学基金青年科学基金(41202107) 教育部高等学校博士学科点专项科研基金(新教师类)(20120007120004) 中国石油大学(北京)科研基金(KYJJ2012-01-20)
【分类号】：P534.52;P618.13
【正文快照】： 0引言柴达木盆地北缘西段(以下简称柴北缘西段)位于盆地西北部阿尔金山和祁连山系交会处,属于柴达木盆地一级构造单元,包括鄂博梁—冷湖一带、南八仙、马海构造带以及苏干湖盆地(或苏干湖凹陷)(见图1),是长期以来石油勘探的重点地区。前人研究分析认为,侏罗系是柴北缘地区主要

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