Seepage Characterization Based on Sandstone Particle Motion Pattern: A Case Study of the TIII Reservoir in the Sangtamu Oilfield

Author:

Duanchuan Lyu12ORCID,Rujun Wang1ORCID,Xixin Wang2ORCID,Chao Wang1ORCID,Zhengjun Zhu1ORCID,Kaiyu Wang1ORCID,Hong Lou1ORCID,Xiaoming Wang1ORCID,Jinpeng Song3ORCID

Affiliation:

1. Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China

2. School of Geosciences, Yangtze University, Wuhan, Hubei 430100, China

3. Exploration Department of Petro China Tarim Oilfield Company, Korla, Xinjiang 841000, China

Abstract

In order to finely characterize the physical properties and seepage characteristics of underwater distributary channel sand bodies in a braided river delta, the particle size distribution, mercury injection, and withdrawal of low, medium, high, and extra-high permeability core samples from the TIII reservoir from 15 core wells in the Sangtamu Oilfield were compared. The pore-throat characteristics of the rocks with different deposition modes and their effects on the fluid seepage were analyzed from the perspective of the deposition processes. The statistical results revealed that the rocks formed in a continuous and stable strong hydrodynamic environment were coarse grained. The seepage capacities of the rock increased as the maximum throat radius connecting with the pores increased. The mercury withdrawal efficiency decreased as the difference between the throat radius and pore radius increased. The percentage of the throat volume without effective seepage to the total volume of the pore-throat system increased as the permeability of the samples increased. Therefore, when characterizing reservoirs based on the porosity and permeability, it is important to differentiate the energy of the hydrodynamic depositional environment of a monogenic sand body in order to improve the accuracy of the understanding of the reservoirs.

Funder

CNPC Innovation Foundation

Publisher

Hindawi Limited

Subject

General Earth and Planetary Sciences

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