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

Abstract

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

CLC Number:

TE121.3

Chen Zhipeng, Ren Zhanli, Cui Junping, Qi Kai, Zhang Yuanyuan, Yu Chunyong, Ren Wenbo, Yang Guiling, Liu Runchuan. 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.

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Age and petroleum geological implications of prolific formations in Ha'ri Depression Well YHC1,Yin'e Basin

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