鄂尔多斯盆地东缘可容纳空间变化控制的C-P煤系沉积特征
发布时间：2018-05-09 17:18
本文选题：鄂尔多斯盆地东缘 + 煤系沉积 ； 参考：《煤炭学报》2017年07期
【摘要】：鄂尔多斯盆地东缘是国内煤系非常规天然气勘探开发的重点地区,区域范围广,沉积环境多变。结合野外露头、钻井岩芯、单井和连井剖面刻画了研究区构造隆降、海水进退、多向物源影响下的层序地层格架和沉积环境演变。结果表明:在统一研究区典型标志层的基础上,可将太原组分为4个和山西组3个III级层序;太原组主煤层顶面是区域范围内的构造转换面,南北地势近乎水平,之后中间地势进一步沉降;北部物源在太原期初始即发生影响,但南部物源到山西期才产生明显影响;研究区大致以北纬38°构造带为南北隆降支点,控制地层的厚度和岩性变化,影响厚煤带的迁移;太原期的汇水中心由南部逐渐向中部过渡,即由延川南(Sq1)到大宁—吉县(Sq2)到柳林石楼地区(Sq4),在Sq3沉积时期,海侵范围相对最大。相关成果对认识研究区含煤地层发育规律,开展煤系非常规天然气勘探开发具有支撑作用。
[Abstract]:The eastern margin of Ordos Basin is a key area for the exploration and development of unconventional natural gas in coal measures in China. Combined with outcrop drilling core single well and continuous well profile the evolution of sequence stratigraphic framework and sedimentary environment under the influence of tectonic uplift drop of sea water and multi-direction provenance in the study area is described. The results show that the Taiyuan component can be divided into 4 III sequences and 3 III sequences on the basis of unifying the typical marker layers in the study area, and the top surface of the main coal seam of Taiyuan formation is the structural transformation surface in the regional scope, and the north-south topography is nearly horizontal. After that, the intermediate topography further subsidence, the northern provenance occurred at the beginning of Taiyuan period, but the southern provenance did not have obvious influence until Shanxi period, and the study area approximately took the 38 掳tectonic belt of north latitude as the fulcrum of north and south uplift, Controlling the thickness and lithologic change of strata, affecting the migration of thick coal belt, the water catchment center of Taiyuan period gradually transitioned from the south to the middle, that is, from south Yanchuan Sq1) to Daning-Ji County Sq2) to Liulin Shilou area, during the Sq3 deposition period, and the change of strata thickness and lithology affected the migration of thick coal belt. The transgression range is relatively largest. The related results can support the development of coal-bearing strata and the exploration and development of unconventional natural gas in coal-bearing measures in the study area.
【作者单位】： 中国矿业大学(北京)地球科学与测绘工程学院;中国地质大学(北京)能源学院;
【基金】：国土资源部公益性行业科研专项基金资助项目(201311015-01) 刘宝s匮嗄昕蒲Щ鹱手钅，
本文编号：1866879
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