华北地区中北部寒武系层序地层格架

发布时间：2018-06-08 22:08

本文选题：层序地层 + 碳同位素　；参考：《石油学报》2017年10期

【摘要】：华北地台寒武系碳酸盐岩是华北地区重要的深部油气勘探目标,加强寒武系层序格架及其充填样式的研究对于指导潜山油气藏和潜山内幕油气藏勘探具有重要的理论与现实意义。在系统分析典型露头剖面岩性和沉积序列发育特征的基础上,结合典型钻井、测井资料和地震资料,共识别出3种层序边界类型,即暴露成因的I型和II型层序边界以及淹没不整合型(III型)层序边界;将华北地区中北部寒武系划分为7个可区域性对比的三级层序,并建立层序地层格架。利用碳酸盐岩全岩碳同位素对全球海平面变化的良好表征性,与露头沉积微相分析得到的相对水深变化规律进行对比,探讨了三级层序发育的主控因素。认为在古气候和沉积充填速率影响不大的背景下,下寒武统CSQ1层序(相当于府君山组或昌平组)、CSQ2层序(相当于馒头组)和上寒武统CSQ5层序(相当于崮山组)的发育受全球海平面变化和板块内差异沉降等构造背景综合控制,特别是CSQ5层序属于典型的淹没不整合型三级层序;CSQ3层序(相当于毛庄组)、CSQ4层序(相当于徐庄组及张夏组)、CSQ6层序(相当于长山组)和CSQ7层序(相当于凤山组)的发育主要受控于全球海平面变化。
[Abstract]:Cambrian carbonate rocks in North China platform are important targets for deep oil and gas exploration in North China. It is of great theoretical and practical significance to strengthen the study of Cambrian sequence framework and its filling pattern for guiding the exploration of buried hill reservoir and buried hill inside oil and gas reservoir. On the basis of systematic analysis of lithology and sedimentary sequence development characteristics of typical outcrop profile, combined with typical drilling, logging data and seismic data, three types of sequence boundary are identified. The Cambrian in the central and northern part of North China is divided into seven third order sequences which can be correlated regionally and the sequence stratigraphic framework is established. By using the carbon isotopes of carbonate rock to characterize the global sea level change and comparing with the relative water depth variation law obtained by outcrop sedimentary microfacies analysis, the main controlling factors of tertiary sequence development are discussed. Under the background of paleoclimate and sedimentary filling rate, The development of the lower Cambrian CSQ1 sequence (equivalent to Fujunshan formation or Changping formation) and the Upper Cambrian CSQ5 sequence (equivalent to Gushan formation) are comprehensively controlled by the tectonic background, such as global sea level change and intraplate differential subsidence. In particular, the CSQ5 sequence belongs to the typical submerged non-integrated third-order sequence CSQ3 sequence (equivalent to the Maozhuang formation and the Zhangxia formation, the same as the Xuzhuang formation and Zhangxia formation) and the CSQ7 sequence (equivalent to the Fengshan formation), in particular, the CSQ5 sequence belongs to the typical submergence non-integrated third-order sequence CSQ3 sequence (equivalent to the Maozhuang formation and the Zhangxia formation, the same as the Xuzhuang formation and the Zhangxia formation). Yu is mainly controlled by global sea level changes.
【作者单位】：中国地质大学能源学院;中国石油学会;西安石油大学地球科学与工程学院西安石油大学陕西省油气成藏地质学重点实验室;中国石油华北油田公司地球物理勘探研究院;中国地质大学地球科学与资源学院;中国石油华北油田公司勘探开发研究院;
【基金】：国家重大科技专项(2016ZX05006-003) 中国石油华北油田公司项目(HBYT-WTY-2015-JS-391)资助
【分类号】：P534.41;P618.13

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