鄂尔多斯盆地深层寒武系碳酸盐岩储层特征与主控因素

doi:10.11743/ogg20210307

Abstract

Abstract:

The Cambrian carbonates are important oil and gas exploration targets in the Ordos Basin.An integration of the latest drilling and seismic data as well as outcrop and thin section observation shows that the Cambrian carbonates contain two major categories of reservoirs, i.e.facies-controlled and intensively structure-modified reservoirs.They can be further subdivided into eight types, of which the epigenetic karst and high-energy dolomitized oolitic shoal are the main reservoirs.The Cambrian carbonates are characterized by well-developed pores, cavities and fractures of different types and high diversity.The study proposes that the Cambrian reservoir development is mainly controlled by the dolomite of high-energy facies, epigenetic karstification of the paleo-uplift zone and faulting activity.And a model for the Cambrian reservoir development is also established.In addition, a discussion based on the study was carried out for the exploration direction of the Cambrian carbonates in the Ordos Basin and it is concluded that the Cambrian fractured-vuggy karst reservoirs around the Qingyang paleo-land at the southwestern margin of the basin shall be the next focus for exploration.

Key words: major control factor, exploration direction, reservoir characteristics, deep carbonate reservoir, Cambrian, Ordos Basin

CLC Number:

TE122.2

Chunlin Zhang, Jingli Yao, Chengshan Li, Fengcun Xing, Liyong Fan, Wuling Mo, Qiuying Zhu, Xu Zeng. Characteristics of deep Cambrian carbonate reservoirs in the Ordos Basin and main control factors[J]. Oil & Gas Geology, 2021, 42(3): 604-614.

Figures/Tables 10

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大类	具体类型	孔隙类型	分布层位	主要岩性
相控型储层	云坪	晶间孔、晶间溶孔等	馒头组-三山子组	白云岩为主
	潮坪微生物云岩	晶间孔、晶间溶孔等	张夏组、三山子组(为主)
	云化鲕粒滩	粒间孔、粒间溶孔和粒内溶孔，强云化主要为晶间孔和晶间溶孔	徐庄组-三山子组
	中缓坡或台前滑塌沉积	白云岩砾石内晶间孔和晶间溶孔，粒间溶孔，可见微裂缝	徐庄组-张夏组
构造强改造型储层	表生岩溶	微裂缝、晶间溶孔、溶洞等	徐庄组-三山子组	灰岩和白云岩
	断溶体	微裂缝、溶洞、晶间溶孔等	徐庄组-三山子组
	裂缝	微裂缝、溶蚀缝等	馒头组-三山子组
其他潜在储层	埋藏(热流体)岩溶	溶洞、晶间溶孔等	张夏组等	白云岩为主

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Characteristics of deep Cambrian carbonate reservoirs in the Ordos Basin and main control factors

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