塔里木盆地塔中地区奥陶系碳酸盐岩封盖性能

doi:10.11743/ogg20120101

Abstract

Abstract:

Mineral composition,micro-pore characteristics and well-logs from five wells were used to study the sealing capacity of the Ordovician carbonate rocks in Tazhong area,Tarim Basin.The Ordovician Lianglitage and Yingshan formations are at substage A-B of the middle diagenetic stage and substage A of the late diagenetic stage.For the Lianglitage Formation grainstone,the breakthrough pressure (BP) is 1.81-29.76 MPa,and the threshold radius (TR) is 13.89-77.35 nm,.For the marlstones,the BP is 14.33MPa and TR is 25.9-44.51 nm.For the micritic limestone with band of argillite,the BP is 0.98-10.35 MPa and the TR is 13.52-142.60 nm.The BP and the TR of the Yingshan Formation limy dolomites are 0.98-10.35 MPa and 13.52-142.60 nm.Thus,the marlstone and partial grainstone of the Lianglitage Formation and the Yingshan Formation dolomite limestone have certain sealing capacity,with thickness over 5 m,BP over 5 MPa,TR between 10-20 nm,pore throat radium less than 0.1 μm.In addition,the tight interval consisted of dolomite limestone with high resistivity of 4-10 m thick in the Yingshan Formation is thought to be local caprocks in Tazhong area.Its existence is one of the main factors resulting in the oil/gas distribution pattern in the Ordovician Yingshan Formation in Zhong-1 well,i.e.oil in its upper part and gas in its lower part.

Key words: diagenetic stage, micro-pore structure, high resistance strata, local sealing, reservoir-cap assemblage, carbonate rock, Tarim Basin

CLC Number:

TE122.2

Qian Yixiong, He ZhiLiang, Chen Qianglu, Li Huili, Lu Qinghua, Cai Xierao, You Donghua. Sealing capacity of the Ordovician carbonate rocks in Tazhong area, the Tarim Basin[J]. Oil & Gas Geology, 2012, 33(1): 1-9,18.

References

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Sealing capacity of the Ordovician carbonate rocks in Tazhong area, the Tarim Basin

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