二连盆地白音查干凹陷下白垩统阿尔善组—都红木组层序地层  

Sequence stratigraphy of the Lower Cretaceous Aershan—Duhongmu Formation in Baiyinchagan Sag,Erlian Basin

作　　者：高红灿[1] 郑荣才[2] 肖斌[3] 刘云[3] 栾艳春[3] 刘虹利[1] GAO Hongcan;ZHENG Rongcai;XIAO Bin;LIU Yun;LUAN Yanchun;LIU Hongli(School of Petroleum Engineering, Chongqing University of Science ＆ Technology, Chongqing 401331, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploration , Chengdu University of Technology, Chengdu 610059, Sichuan, China;Geophysical Research Institute of Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, Henan, China)

机构地区：[1]重庆科技学院石油与天然气工程学院,重庆401331 [2]成都理工大学"油气藏地质与开发工程"国家重点实验室,四川成都610059 [3]中国石化中原油田分公司物探研究院,河南濮阳457001

出　　处：《中国地质》2018年第2期286-303,共18页Geology in China

基　　金：重庆市科委前沿与应用基础研究(一般)项目(cstc2014jcyj A90022);重庆科技学院科研基金(CK2016B14)联合资助~~

摘　　要：层序地层学是岩性-地层油气藏勘探研究的核心技术之一。为深入开展二连盆地白音查干凹陷岩性-地层油气藏勘探,在前人研究成果基础上,通过研究区200多口井的精细地层对比和33口井759.42 m岩心的详细观察及区域构造-沉积演化分析,综合运用构造、古生物、岩性、测井以及地震反射等5个方面的特征,对白音查干凹陷(主要是西部次凹)油气勘探的主要目的层下白垩统阿尔善组—都红木组的层序发育特征进行再认识,对层序界面的性质进行重新厘定。将白音查干凹陷下白垩统阿尔善组—都红木组划分为2个超长期层序(分别对应于阿尔善组—腾格尔组和都红木组)和5个长期层序(分别对应于阿尔善组一段、阿尔善组二段、腾格尔组、都红木组一段和都红木组二段~三段);提出白音查干凹陷下白垩统腾格尔组长期层序的底界面为一连续沉积的整合面,不能构成油气运移的良好通道,即在腾格尔组底部即使圈闭条件良好(如锡40井—锡43井区),但也会因缺乏良好的油气运移通道致使圈闭中供油不足而不能成藏。Sequence stratigraphy is a key technology for exploration of stratigraphic-lithological reservoirs. For the purpose of pushing forward the stratigraphic-lithological reservoirs exploration of Baiyinchagan Sag in Erlian Basin, on the basis of previous researches, and through delicate stratigraphical correlation of over 200 wells, detailed core description of 759.42 meters from 33 wells, and analysis of regional tectonic-sedimentary evolution, the authors recognized the sequence stratigraphic characteristics of the main target for petroleum exploration in Baiyinchagan Sag （i.e., the Lower Cretaceous Aershan-Duhongmu Formation） and redefined the sequence boundary properties according to various kinds of data such as tectonic geology, paleontology, petrology, logging and seismic reflection. The results show that the Lower Cretaceous Aershan-Duhongmu Formation of Baiyinchagan Sag can be divided into two super long-term sequences and five long-term sequences. The two super long-term sequences correspond to the Aershan-Tenggeer Formation and the Duhongmu Formation. The five long-term sequences correspond to the 1st member of Aershan Formation, the 2nd member of Aershan Formation, Tenggeer Formation, the 1st member of Duhongmu Formation and the 2nd to the 3rd member of Duhongmu Formation. Meanwhile, this paper indicates that the long-term sequence bottom boundary of Tenggeer Formation in Baiyinchagan Sag is a conformity surface, which can not form the favorable pathways for oil-gas migration. In another word, even if there are good trap conditions in bottom boundary of Tenggeer Formation of Baiyinchagan Sag, for example Xi40-Xi43 wellblock, there is no hydrocarbon accumulation due to lacking the favorable pathways of oil-gas migration and the associated insufficient hydrocarbon supply.

关 键 词：二连盆地 白音查干凹陷 下白垩统 阿尔善组 腾格尔组 都红木组 层序地层 

分 类 号：P539.2[天文地球—古生物学与地层学] P618.13[天文地球—地质学]