银额盆地哈日凹陷YHC1井高产油气层时代归属及油气地质意义

doi:10.11743/ogg20190214

摘要/Abstract

摘要： 针对银额盆地哈日凹陷YHC1井高产油气层时代归属及白垩系与二叠系界线位置争议问题，文章在前人研究的基础上，结合微古生物化石、火山岩同位素测年、岩石矿物组成及地震反射响应特征等开展了层位归属与不整合界面位置确定研究。研究表明，YHC1井高产油气层段及其上部地层的孢粉组合与哈1井、查参1井下白垩统可以进行较好对比；高产油气层下部的火山岩锆石U-Pb年龄为131.8~132.6 Ma，指示早白垩世早期；高产油气层的矿物组成与下白垩统一致，而与二叠系有较大区别；高产油气层和火山岩在地震反射剖面中均位于断陷层内。综上所述，哈日凹陷YHC1井新发现的高产油气层应归属下白垩统，白垩系与二叠系的不整合界面则位于巴音戈壁组火山岩底部。高产油气层时代的确定对研究区油气资源评价及勘探方向选择具有重要意义，也指示银额盆地下白垩统具有良好的油气勘探潜力。

关键词: 锆石U-Pb年龄, 孢粉组合, 勘探潜力, 高产油气层, 下白垩统, 银额盆地

Abstract: There have always been controversial opinions about the age of prolific formations in Ha'ri Depression Well YHC1,Yin'e Basin and the location of unconformity surface between the Cretaceous and Permian.To sort out such controversies,we studied the age of prolific formations in the region and the exact location of the boundary line,based on previous research.The micro-fossils,U-Pb zircon dating of volcanic rocks,mineral compositions and seismic reflection cha-racteristics were analyzed for this purpose.Results show that the sporopollen assemblages of the prolific formations and layers above Well YHC1 can be compared with those of the Lower Cretaceous in Wells Ha1 and Chacan1.The U-Pb zircon ages of the volcanic rocks under the prolific formations are ranging from 131.8Ma to 132.6Ma,indicating that the volca-nic rocks are products of Early Cretaceous eruptions.The mineral compositions of prolific formations are consistent with those of the Lower Cretaceous,but very different from those of the Permian.In addition,both the prolific formations and the volcanic rocks are located within the faulted depression,which is seen from the seismic reflection profile.To sum up,the prolific formations discovered in Ha'ri Depression Well YHC1should fall in the category of the Lower Cretaceous,and the unconformity surface between the Cretaceous and Permian should be located at the bottom of the Bayingebi Formation volcanic rocks.This study is of great significance to hydrocarbon evaluation and exploration in the research zones,and marks brigh prospects for oil/gas exploration in the Lower Cretaceous Yin'e Basin.

Key words: U-Pb zircon dating, sporopollen assemblage, exploration potential, prolific formation, Lower Cretaceous, Yin'e Basin

中图分类号:

TE121.3

陈志鹏,任战利,崔军平,等. 银额盆地哈日凹陷YHC1井高产油气层时代归属及油气地质意义[J]. 石油与天然气地质, 2019, 40(2): 354-368. doi: 10.11743/ogg20190214 Chen Zhipeng,Ren Zhanli,Cui Junping,et al. Age and petroleum geological implications of prolific formations in Ha'ri Depression Well YHC1,Yin'e Basin[J]. Oil & Gas Geology, 2019, 40(2): 354-368. doi: 10.11743/ogg20190214

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