辽河坳陷沙三、沙四段泥页岩微观孔隙特征及其成藏意义

Abstract

Abstract: In order to further study the pore characteristics of shale reservoir oin Sha-3 and Sha-4(the 3^rd and 4^th Member of Shahejie Formation respectively)and their accumulation significance in Liaohe depression,samples from 5 wells were chosen to conduct a series of experiments including focused ion beam-scanning electron microscope(FIB-SEM),helium adsorption and desorption,whole rock analysis by XRD,microscopic examination of kerogen and related organic geochemistry experiments.The results show that there are 6 types of pore including intergranular pore,intragranular pore,inter-crystal pore,dissolution pore,organic pore and micro-cracks.Furthermore,development of these pores are not only related to sedimentary compaction,cementation and dissolution,but also closely related to the lithology,mineral fabric,type of organic matter and organic geochemistry.The intergranular pores and interlayer micropores and cracks of clay mineral aggregates make the greatest contribution to the storage and migration of shale oil and gas,and they are also the major controlling factor of the anisotropic(permeability)of the shale reservoir,followed by the dissolution pores and inter-crystal pores.The organic pores contribute the least due to the relatively poor development,but they still plays an important role in storage of absorbed shale oil and gas.Meanwhile, micro-cracks are also negligible in connecting macro-pores and meso-pores.In addition,large amount of organic pores are found in adhesive-combining organic matter with low maturity,indicating that clay minerals play an important role in the early period of hydrocarbon generation.The feature of close symbiosis between organic matter and minerals(mainly clay minerals)also reflects the close relationship between the preservation pattern of organic matter and hydrocarbon generation.The experiments also demonstrate that the amorphous solid is the major contributor to the generation of shale oil and gas in Sha-3 and Sha-4 shale.

Key words: FIB-SEM, pore characteristics, hydrocarbon accumulation, Shahejie Formation, Liaohe Depression

CLC Number:

TE122.2

Yang Chao, Zhang Jinchuan, Li wanjun, Jing Tieya, Sun Rui, Wang Zhongpeng, He Wei, Lu Yaya. Microscopic pore characteristics of Sha-3 and Sha-4 shale and their accumulation significance in Liaohe Depression[J]. Oil & Gas Geology, 2014, 35(2): 286-294.

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Microscopic pore characteristics of Sha-3 and Sha-4 shale and their accumulation significance in Liaohe Depression

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