摘要
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。
Petroleum explorations were concentrated on the Cenozoic formation for a long time in Kongnan area,Huanghua Depression.Mesozoic formation is deep burial and complex structure.There is short of under-standing of Mesozoic Stratigraphic.Mesozoic sequence stratigraphic in Central hebei depression for references,fossil identification,sedimentary rhythm cycle correlation,meticulous horizon calibration for unconformity surface identification,stratigraphic division using log and seismic data in Kongnan area,the top and bottom of mesozoic stratigraphic have studied for the first time.The stratigraphic correlation and sedimentary characteristics have also studied in Kongnan area.The results show that the fossil assemblage has the characteristic of Juras-sic fossil assemblage in Kongnan area.The paleontological fossils data,well logging data and the seismic data proved that the top of the mesozoic formation is at the bottom of sand-shale depositional assemblage undered the andesite and the bottom of the mesozoic formation is at the top of pebbled sandstone upper the shiqian-feng group.The mesozoic stratigraphic divided from below are Geyucheng formation,Yangcun formation and Suqiao formation in Kongnan area.The study indicated that Geyucheng formation and Suqiao formation are be-long to the braided river facies and Yangcun formation is belong to meandering river facies.The distribution of sandstone is controlled by three source direction,northern,eastern and southwest.
出处
《中外能源》
CAS
2016年第4期50-56,共7页
Sino-Global Energy
关键词
黄骅坳陷
孔南地区
中生界
顶底界限
沉积演化
Huanghua Depression
Kongnan area
Mesozoic
boundary of top and bottom
sedimentary evolution
