--> Quantitative Pore-Throad-Fracture Characterization of Tight Sandstone: A Case Study in Tarim Basin of China

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Quantitative Pore-Throad-Fracture Characterization of Tight Sandstone: A Case Study in Tarim Basin of China

Abstract

The lower Cretaceous Bashijiqike Formation is an important regional clastic gas reservoir in north Tarim basin of China. The reservoir has become serious tight due to the influence of kinds of diagenesis. The tight reservoir space is complex, due to ternary porosity distributions composed of pore, throat, and fractures. Recently, matrix related microporosity(at the micrometer to nanometer scale) has been recognized as an important control on transmissivity and storage capacity of hydrocarbons. Advances in completion technologies for low-permeability reservoirs make quantifying the matrix-related micro-porosity and understanding pore size and pore throat distributions as well as tortuosity increasingly important. Traditional methodologies are often inadequate which focused on micrometer (greater than tens of micrometer) scale that are visible in hand samples and thin sections for low permeability microporous reservoirs. Meanwhile, comprehensive formation evaluation process should incorporate the properties of pores at the micrometer to nanometer scale. Within clastic reservoirs, the fracture porosity contribution is often overshadowed by the relative contribution from matrix, yet it is the fracture-pore network to promote the effective hydrocarbon transport and accumulation, and to ensure the high yield of the gas.