超深层灰岩孔隙-微孔隙特征与成因——以塔里木盆地顺南7井和顺托1井一间房组灰岩为例

doi:10.11743/ogg20170406

Abstract

Abstract: Development of effective reservoir space,genetic mechanism and reservoir quality of deep to ultra-deep limestone are key concerns of deep to ultra-deep oil and gas exploration.Detailed core observations,computerized tomography,microscopy,cathodoluminescence and scanning electron microscopy analyses were carried out to characterize the petrology and pore spaces of limestone samples from the Yijianfang Formation in Shunnan-7 and Shuntuo-1 wells in Tarim Basin.Pores in the Lower Yijianfang Formation limestones (Well Shunnan-7) are dominated by fenestrae and shelter pores,which survived the cementation in the deposition to early diagenetic stages.Micro-pores are calcite intercrystalline pores in algae particles,and their formation might be jointly controlled by recrystallization and maturation of original organic matters.The pores of boundstones in the Upper Yijianfang Formation (Well Shuntuo-1) are dominated by moldic pores in biological shells and inter-crystalline pores within aggregates of silica spheres and euhedral calcites;their micro-pores are mainly biomembrane micro-pores,inter-crystalline micro-pores resulted from recrystallization of calcites and micro-pores in euhedral quartz in limestone matrix.Hydrothermal alteration in the early diagenetic stage may be the major genetic mechanism of pores and micro-pores in Well Shuntuo-1.The early hydrocarbon charging may play an important role in the preservation of pores and micro-pores during burial.Our results show that the characteristics and genesis of pores and micro-pores of limestones with different structural features in different wells are different.Thus,the controlling factors for the development and distribution of ultra-deep limestone reservoirs are complicated.

Key words: pore, micro-pore, algal limestone, microbial boundstone, ultra-deep strata, Yijianfang Formation, Tarim Basin

CLC Number:

TE122.2

You Donghua, Han Jun, Hu Wenxuan, Qian Yixiong, Cao Zicheng, Chen Qianglu, Li Huili. Characteristics and genesis of pores and micro-pores in ultra-deep limestones:A case study of Yijianfang Formation limestones from Shunnan-7 and Shuntuo-1 wells in Tarim Basin[J]. Oil & Gas Geology, 2017, 38(4): 693-702.

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Characteristics and genesis of pores and micro-pores in ultra-deep limestones:A case study of Yijianfang Formation limestones from Shunnan-7 and Shuntuo-1 wells in Tarim Basin

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