鄂尔多斯盆地临兴地区上石盒子组浅水三角洲沉积相研究  

A Study of Shallow-Water Deltaic Facies From Upper Shihezi Formation in Linxin Area,Ordos Basin

作　　者：谢英刚[1] 孙新阳[2] 万欢[1] 段长江[1] 陈庆 喻玉洁 

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300457 [2]中联煤层气有限责任公司,北京100011 [3]北京油源恒业科技有限公司,北京100015

出　　处：《非常规油气》2017年第2期13-21,共9页Unconventional Oil & Gas

摘　　要：根据岩性特征、电性特征、沉积构造特征、粒度分析和测井相分析,对临兴地区上石盒子组沉积相进行了研究。通过岩心描述定相与单井相剖面划分,定性—半定量评价不同沉积相岩石属性的测井响应特征,建立准确的测井相模式;在沉积体系及相模式宏观控制下,以测井相为依据,以剖面相为控制,考虑沉积相空间分布与配置关系,进行目的层位沉积相平面展布分析。结果表明,临兴地区上石盒子组以中细砂岩为主,岩性组合以正韵律为主;泥岩颜色以褐红色为主,夹灰色和灰绿色,表明为弱氧化—弱还原环境。结合各相标志判断临兴地区上石盒子组发育浅水三角洲沉积体系。纵向上单砂体规模较小,叠加成片,以(水下)分流河道为骨架微相。平面上常表现为"鸟足状"和"树枝状",具有横向规模大、多分叉、多河道的沉积特点。We carried out this research for upper Shihezi formation in Linxing area based on the lithology, petrophysical study, grain size analysis, sedimentary features, structural characteristics and well log analysis. Through core description and single-well-facies stratigraphic division, the features of logging response of rock properties from dif- ferent sedimentary facies are evaluated, which leads to the accurate establishment of eleetrofacies model. Based on electrofaeies and stratigraic facies divisions, we further combine the spatio-temporal topological relationships of sedimentary facies, thus the distributional characteristics of facies of target rock formations are comprehensively analyzed. The results demonstrate： Upper Shihezi formation is mainly composed of medium-fine-sized sandstones fining upwards. Mudstones is major of maroon color with greyish and greyish-green interlayers which indicates the weakoxidation to weak-reduction environment. Combing all the facies＇ marks, upper Shihezi formation in Linxing area is considered to develop in a shallow-water lacustrine deltaic environment. In this depositional system, sand-bodies are smaller sized upwards with underwater distributary channel as framework microfacies. In the planar view, sands distribute in shape of bird-foot and channels exhibit a large horizontal scale and featured by fureation.

关 键 词：临兴地区 浅水三角洲 相标志 沉积微相 

分 类 号：P618.13[天文地球—矿床学] P631.81[天文地球—地质学]