T52 Lacustrine Petroleum Systems Around the World

Sunday, 22 September 2024
1:30 PM - 5:30 PM
211B

COST-EFFECTIVE DEVELOPMENT OF LACUSTRINE SHALE OIL IN BOHAI BAY BASIN, CHINA: CONNECTIVITY, WETTABILITY, MOVABILITY, AND FRACABILITY

Paper number: T52-5
Program: Technical Sessions
Time: 2:20 PM – 2:40 PM

Authors

  • Qinhong Hu Presenting Author
    China University of Petroleum (East China), Qingdao
  • Huimin Liu
    Shengli Oilfield of SinoPec, Dongying
  • Pu Xiugang
    PetroChina Dagang Oil Field Company, Tianjin
  • Shengyu Yang
    China University of Petroleum (East China), Qingdao
  • Qiming Wang
    China University of Petroleum (East China), Qingdao
  • Tao Zhang
    The University of Texas at Arlington, Arlington, TX
  • Zizhi Lin
    China University of Petroleum (East China), Qingdao
  • Na Yin
    China University of Petroleum (East China), Qingdao

Abstract

Shale oil development from lacustrine depositions in China has been showing major breakthroughs towards economic and sustainable production, but also implicated with a steep production decline in stimulated shale formations. Working with Paleogene-aged Shahejie and Kongdian Formations with low to moderate maturity in Bohai Bay Basin, China, this presentation shows that the limited matrix-fracture interaction (e.g., anomalous matrix feeding of petroleum molecules from the poorly-connected matrix pore space to the hydraulically-stimulated fracture networks) is the root cause of steep initial decline and low overall recovery. The matrix-fracture interaction is influenced by connectivity, wettability, movability, and fracability of shale formations, such as a predominance of minerals-related and generally water-wet pore space in shales of low to moderate maturity. However, there is a poor pore connectivity of fine-grained shale matrix with a wide spectrum of nm-μm sized pore networks to lead to anomalous diffusion and limited movability, and it’s important to assess the fracability to generate intensive fracture networks to reduce the matrix feeding distance for a sustained shale petroleum production. This is achieved by utilizing a set of complementary and experimental approaches such as porosimetry (mercury intrusion porosimetry, low-pressure gas physisorption isotherm, nuclear magnetic resonance), imaging [X-ray computed tomography, Wood’s metal impregnation, field emission-scanning electron microscopy (SEM), focus ion beam-SEM, µm and nm-CT), scattering (ultra- and small-angle neutron and X-ray)], the utility of both hydrophilic and hydrophobic fluids and associated tracers as well as fluid invasion tests (imbibition, diffusion, vacuum saturation) followed by laser ablation-inductively coupled plasma-mass spectrometry imaging of different nm-sized tracers.

Geological Society of America Abstracts with Programs. Vol. 56, No. 5

doi: 10.1130/abs/2024AM-402690

© Copyright 2024 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.