二连盆地白音查干凹陷层序地层及其油气勘探意义

SEQUENCE STRATIGRAPHY OF THE BAYAN QAGAN SUBBASIN IN THE EREN BASIN AND APPLICATIONS FOR PETROLEUM EXPLORATION

基于测井和地震资料分析,识别了二连盆地白音查干凹陷的层序界面,建立了凹陷层序地层格架,研究凹陷内部沉积相类型及其平面展布特征,并建立了单断箕状断陷盆地沉积相模式。根据油气生、储、盖组合特征,预测腾格尔组(层序Ⅲ)和都红木组一段(层序Ⅳ)为油气有利成藏层位,南部缓坡河道砂体储集层和北部陡坡冲积扇储集层为油气有利储集相带,达尔其断块和桑合地区为油气有利成藏区块。

Based on an analysis of well-log data and seismic profiles, the authors have identified the main sequence boundaries in the Bayan Qagan subbesin of the Eren basin esubuished the sequence stratigraphic framework of the subbasin and described the types distribution and constructed a sedimentary facies model of this half of sedimentary facies and their plan graben. According to the features of the source-reservoir-cap rock assemblage, the authors predict that： the Tengger Formation （sequence Ⅲ） and the first member of the Duhongmu Formation （ sequence Ⅳ） are the favorable target zones for petroleum exploration, the fluvial sand bodies along the southern gentle slope and alluvial fan deposits along the northern steep slope are the favorable reservoir zones for hydrocarbon accumulation and the Da＇erqi fault-block and Sanghe district are favorable blocks for hydrocarbon accumulation.