大型坳陷湖盆定量化沉积相编图新方法——以鄂尔多斯盆地中部长7油层组为例

发布时间：2018-06-10 20:07

本文选题：定量化编图 + 细粒沉积　；参考：《岩性油气藏》2017年03期

【摘要】：为满足现今非常规油气勘探需求,提高沉积相编图的精度和效率,以鄂尔多斯盆地三叠系延长组长7油层组为研究对象,对其沉积岩相、分布特征、组合规律、演化趋势等进行了系统研究,综合录井图分析表明:长7油层组共发育10种岩性,其中以细砂岩、泥质粉砂岩、粉砂质泥岩、泥岩和页岩等5种岩性为主,占地层厚度的97%左右。通过岩心观察和统计分析,建立了每种沉积微相或亚相对应的5种主要岩性厚度比例组合,提出了利用主要岩性厚度比例组合实现定量化沉积相编图的新方法。利用该方法在长7油层组主要岩性厚度百分比等值线叠加图上,识别并精细划分出各类沉积微相或亚相,包括三角洲平原分流河道、三角洲前缘水下分流河道、水下分流间湾、远砂坝、河口坝、前三角洲、砂质碎屑流、浊流和半深湖—深湖等。
[Abstract]:In order to meet the demand of present unconventional oil and gas exploration and improve the accuracy and efficiency of sedimentary facies mapping, taking the formation of Chang 7 of Triassic in Ordos Basin as the research object, the sedimentary lithofacies, distribution characteristics and assemblage law are studied. The evolution trend has been systematically studied. The comprehensive logging analysis shows that there are 10 kinds of lithology in Chang7 formation, of which 5 are fine sandstone, argillaceous siltstone, silty mudstone, mudstone and shale. Covers about 97% of the thickness of the layer. Through core observation and statistical analysis, five major lithologic thickness combinations corresponding to each sedimentary microfacies or subfacies are established, and a new method of quantifying sedimentary facies mapping by using the proportion combination of main lithologic thickness is put forward. By using this method, various sedimentary microfacies or subfacies, including delta plain distributary channel, delta front underwater distributary channel and underwater distributary bay, are identified and subdivided on the main lithologic thickness percentage isoline superposition map of Chang 7 reservoir formation. Far bar, estuary dam, pre-delta, sand clastic flow, turbidity flow and semi-deep lake-deep lake.
【作者单位】：中国石油勘探开发研究院;
【基金】：国家重大科技专项“致密油形成条件、聚集机理与富集规律”(编号:2016ZX05046-001)资助
【分类号】：P618.13

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