成都理工大学学报（自然科学版）2017，Vol.44Issue(5)：553-564,12.DOI:10.3969/j.issn.1671-9727.2017.05.06
鄂尔多斯盆地南缘长7油层组碳酸盐结核的特征及石油地质意义
The carbonate concretions of Chang-7 and their hydrocarbon significance in southern Ordos Basin, China
摘要
Abstract
Carbonate concretions,usually the products of microbial activity,can provide the information of diagenetic processes.On the basis of field investigation,thin section observation,application of scanning electron microscopy,X-ray diffraction and carbon oxygen isotopes,the limestone and dolomite concretions,abundant in the oil shales of Chang-7 (Member 7 of Upper Triassic Yanchang Formation) in Weibei area of the southern Ordos Basin,are studied.It is considered that the limestone and dolomite concretions are products of early diagenesis and the formation of calcite pellets and dolomite pellets is formed early and their features are similar to the algae.δ13C,which evidently heavier than the variation range of δ13C during late Triassic,indicating that the formation of the carbonate concretions is related to the methane formation resulted from alkane producing and microbial metabolic activity.The formation of calcite pellets and dolomite pellets in the Chang-7 concretions is probably related to microbial activity and the carbonate nodules in the Chang-7 are indicator of favorable source rocks with good hydrocarbon generating capacity.关键词
鄂尔多斯盆地/延长组/油页岩/碳酸盐结核Key words
Ordos Basin/Yanchang Formation/oil shale/carbonate concretions分类
天文与地球科学引用本文复制引用
董杰,胡作维,袁效奇,贺静,李云,王玉龙..鄂尔多斯盆地南缘长7油层组碳酸盐结核的特征及石油地质意义[J].成都理工大学学报（自然科学版）,2017,44(5):553-564,12.基金项目
国家自然科学基金项目(41302085,41372113,41102063) （41302085,41372113,41102063）
国家科技重大专项(2011ZX05001,2011ZX05044) （2011ZX05001,2011ZX05044）
高等学校博士学科点专项新教师类科研基金项目(20135122120006,20115122120004) （20135122120006,20115122120004）
油气藏地质及开发工程国家重点实验室开放研究基金项目(PLC201408) （PLC201408）
成都理工大学中青年骨干教师培养计划项目(KYGG201532,KYGG201208). （KYGG201532,KYGG201208）
