鄂尔多斯盆地延长组陆相页岩孔隙类型划分方案及其油气地质意义

doi:10.11743/ogg20160101

Abstract

Abstract: The continental Yangchang shale reservoirs in Ordos Basin are unconventional reservoirs,for which no specific pore classification scheme is available.Based on an investigation of pore type classifications of both abroad and domestic,we selected two classification schemes suggested by Loucks and Yubingsong and proposed a new classification upon modification of the previous two by combining the actual observation data of samples taken from the Formation.Argon ion milling scanning electron microscope was employed to characterize and systematically probe into pore development(including forming mechanisms,scale and geological bearings)of the reservoirs.The results show that pores in between congregated mineral lamellae contribute most to oil and gas poolings and followed by pyrite intergranular pores,organic pores,microfractures and pores in clay mineral lamellae.Intergranular pores and edge pores of rigid particles are still less meaningful in terms of geological indication.Solution pores among quartz grains are believed to be the least important among all types of pores found in the reservoirs.

Key words: pore structure, classification scheme, continental shale, Ordos Basin

CLC Number:

TE122.2

Wang Xiangzeng, Zhang Lixia, Li Zongtian, Fu Haijiao. Pore type classification scheme for continental Yanchang shale in Ordos Basin and its geological significance[J]. Oil & Gas Geology, 2016, 37(1): 1-7.

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Pore type classification scheme for continental Yanchang shale in Ordos Basin and its geological significance

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