论文部分内容阅读
长期以来黄骅坳陷孔南地区油气勘探主要集中在新生界,中生界由于埋藏深、地质构造复杂,对地层认识较欠缺。本次研究在借鉴冀中坳陷中生界地层层序划分,通过孔南地区古生物化石鉴定、沉积韵律旋回性对比、精细层位标定识别不整合面、井震结合地层对比等技术手段,首次开展中生界顶底界限研究,建立起中生界层组精细划分与对比标准,并开展沉积演化特征分析。研究结果表明:孔南地区中生界地层化石组合具有典型侏罗系化石组合特征,古生物化石资料、测井资料、地震资料证实中生界顶为大套安山岩之下一组砂泥岩韵律层的底,其底界为石千峰群之上的含砾砂岩段底界。孔南地区中生界地层自下而上依次划分为葛渔城组、杨村组及苏桥组,葛渔城组与苏桥组以辫状河沉积为主,杨村组以曲流河沉积为主,砂体展布主要受北部、东部及西南部3个方向的物源控制。
For a long time, the oil and gas exploration in Kongnan area of Huanghua Depression has been mainly concentrated in the Cenozoic. Mesozoic strata, due to their deep burial and complex geological structure, lack understanding of the strata. Based on the sequence of the Mesozoic stratigraphic sequence in Jizhong Depression, this study is based on the identification of palaeontology fossils in the Kongnan area, the contrast of sedimentary rhythm, the identification of unconformity by fine horizon calibration, and the comparison of wellbore and formation stratigraphy. To carry out research on the boundaries of the top and bottom of the Mesozoic, to establish the fine division and contrast criteria of the Mesozoic strata group, and to carry out the analysis of sedimentary evolution characteristics. The results show that the Mesozoic stratigraphic fossil assemblage in the Kongnan area has the characteristics of typical Jurassic fossil assemblages. Paleontological fossils, logging data and seismic data confirm that the Mesozoic boundary is the top of a set of sandstone and mudstone rhythm layers At the bottom, the bottom boundary is the bottom boundary of gravel sandstone above Shiqianfeng Group. The Mesozoic strata in Kongnan area are divided into Geyucheng Formation, Yangcun Formation and Suqiao Formation from the bottom to top. Geyucheng Formation and Suqiao Formation are dominated by braided river sediments. Yangcun Formation is mainly composed of meandering river Sedimentary, sand body distribution mainly by the north, east and southwest of the three directions of the source control.