Comparison of Pore Structure Characteristics of Shale-Oil and Tight-Oil Reservoirs in the Fengcheng Formation in Mahu Sag

Author:

Liu Guoyong1,Tang Yong2,Liu Kouqi3,Liu Zuoqiang4,Zhu Tao2,Zou Yang2,Liu Xinlong2,Yang Sen2,Xie An5

Affiliation:

1. PetroChina Qinghai Oilfield Company, Dunhuang 736200, China

2. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, China

3. Institute of Energy, Peking University, Beijing 100871, China

4. Research Institute of BGP Inc., China National Petroleum Corporation, Zhuozhou 072751, China

5. Xinjiang Research Institute of Huairou Laboratory, Urumqi 830000, China

Abstract

Despite the abundance of shale-oil and tight-oil reserves in the Fengcheng Formation within the Mahu Sag, exploration and development efforts for both types of reservoir are still in their early stages. A comprehensive examination and comparison of the pore structures of these reservoirs can establish rational classification and evaluation criteria. However, there is a dearth of comparative analyses focusing on the pore structures of shale-oil and tight-oil reservoirs within the Fengcheng Formation. This study addresses this gap by systematically analyzing and comparing the pore structures of these reservoirs using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), low-temperature nitrogen adsorption, and mercury intrusion capillary pressure experiments (MICP). The results show that the shale oil within the Fengcheng Formation exhibits a higher content of carbonic acid compared to the tight-oil samples. Furthermore, it demonstrates smaller displacement pressure and median pressure, a larger sorting coefficient, and superior permeability in contrast to tight oil. Notably, the shale oil within the Fengcheng Formation is characterized by abundant striated layer structures and micro-fractures, which significantly contribute to the microstructural disparities between shale-oil and tight-oil reservoirs. These differences in microstructures between shale oil and tight oil within the Fengcheng Formation in the Mahu Sag region delineate distinct criteria for evaluating sweet spots in shale-oil and tight-oil reservoirs.

Publisher

MDPI AG

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