压实对页岩有机质孔隙发育控制作用——以四川盆地东南地区及周缘下古生界为例

doi:10.11743/ogg20210107

Abstract

Abstract:

Pores in organic matter are important storage space for gas or oil in shale. Present researches are focused more on the genesis and description of the pores and less on the secondary compaction that also plays a role in the modification of the pores under diverse geological conditions. This paper studies the modification of the pores under compaction with samples from the Lower Paleozoic black shale of southeastern Sichuan Basin and its periphery being observed with scanning electron microscopy (SEM) and analyzed with quantitative pore statistics and gas adsorption techniques. The results show that the deformation and orientation arrangement of pores commonly seen in the organic matter samples can be related to the actual occurrence of the organic matter: the pores are generally destroyed under compaction when in organic matter along beddings, or squeezed to deform locally when in organic matter serving as fillings in shale or just deformed by clay minerals when in organic matter-mineral aggregates. In addition to the occurrence, the pores are also affected by microscopic mineral framework, rock plasticity determined by organic matter content, and their own size.

Key words: occurrence, compaction and deformation, mineral framework, compaction, organic pore, shale, the Lower Paleozoic, southeastern Sichuan Basin

CLC Number:

TE122.2

Qian Chen, Xiangbin Yan, Chaoying Liu, Xiaoliang Wei, Zhe Cheng, Weijun Qin, Taiyuan Hong. Controlling effect of compaction upon organic matter pore development in shale: A case study on the Lower Paleozoic in southeastern Sichuan Basin and its periphery[J]. Oil & Gas Geology, 2021, 42(1): 76-85.

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Controlling effect of compaction upon organic matter pore development in shale: A case study on the Lower Paleozoic in southeastern Sichuan Basin and its periphery

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