四川盆地寒武系洗象池群层序地层划分及层序地层格架的建立

发布时间：2018-04-14 11:20

本文选题：四川盆地 + 洗象池群　；参考：《地质科技情报》2017年02期

【摘要】：四川盆地寒武系洗象池群发育大套白云岩,由于岩性、电性差异小,化石稀少,地层厚度变化大,层序划分与演化特征一直存在很大争议。基于层序地层学及沉积学相关理论研究,通过对露头剖面、钻井岩心的观察及测井资料的研究,结合测井曲线频谱趋势分析技术及碳氧同位素相关数据,开展对洗象池群层序地层的划分及建立全盆地统一的层序地层格架研究。盆地内虽然基本都是一套白云岩,各分区命名差异大,但依然具有全盆范围内可对比的不整合界面和最大海泛面。研究认为四川盆地洗象池群可划分为4个三级层序,并且厘定了盆地内各分区间的层序地层对应关系。在建立全盆地层序地层格架的基础上,发现洗象池群地层分布呈西薄东厚的楔形体,其中遂宁-乐至-资阳以西缺乏洗象池群沉积。层序格架内有利储集层的分布明显受控于层序界面,其中颗粒滩相主要发育在高位体系域。
[Abstract]:The Cambrian Xixiang pool group in Sichuan basin developed a large set of dolomite. Because of its lithology, small difference in electrical properties, rare fossils and great changes in stratigraphic thickness, the division of sequence and the characteristics of evolution have always been controversial.Based on the theoretical study of sequence stratigraphy and sedimentology, through the observation of outcrop profile, drilling core and logging data, combined with logging curve spectrum trend analysis technology and carbon-oxygen isotope related data.The division of sequence stratigraphy and the establishment of a unified sequence stratigraphic framework of the whole basin are carried out.Although the basin is basically a set of dolomite with great differences in the naming of each zone, it still has a comparable unconformable interface and the largest sea panoramic surface in the whole basin.It is considered that the Xixiang pool group in Sichuan Basin can be divided into four third-order sequences, and the sequence stratigraphic correspondence of each interval in the basin is determined.Based on the establishment of sequence stratigraphic framework in the whole basin, it is found that the strata of the Xianghuangchi Group are in the form of a west thin and thick wedge body, in which the west of Suining, Lezhi and Ziyang lacks the deposit of the wash elephant pool group.The distribution of favorable reservoirs in the sequence framework is obviously controlled by the sequence interface, in which the grain-beach facies mainly develop in the high system tract.
【作者单位】：中国石油勘探开发研究院;中国石油西南油气田公司;
【基金】：国家重大专项(2011ZX05004-002)
【分类号】：P618.13;P534.41

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