| Author's Name: DENG Xingliang1,2,3, CHANG Shaoying4, CHEN Fangfang1,2,3, CHEN Jiajun4,
WANG Peng1,2,3, CAO Peng5, WANG Mengxiu4, YAO Qianying4,
ZHAO Longfei1,2,3, YE Tingyu6 |
| Institution: 1. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company;
2. Technology Research and Development Center for Ultra-Deep Oil and Gas Exploration and Development, PetroChina; |
| Abstract: |
| The cratonic strike-slip fault zone is an important hydrocarbon accumulation zone in the ultra-deep carbonate
rock field of Tarim Basin. At present, the natural energy of the oil reservoirs in the strike-slip fault zone is insufficient,
and the decline rate of the oil reserves is fast. It is urgent to deepen the understanding of the geological characteristics of
such oil reservoirs, explore new development methods, and investigate countermeasures for enhancing recovery rate.
Based on the detailed study of the 12th and 17th fault zones in Fuman Oilfield through comprehensive analysis of
outcrops, drilling, seismic surveys, core thin sections, production dynamics, well tests and other data, the types of reservoir
space, internal structural characteristics and hydrocarbon accumulation features of the fractured breccia reservoirs are
precisely characterized. Appropriate countermeasures for enhancing recovery rate are proposed. The research results
indicate: (1) The fractured breccia reservoirs belong to vertical plate-shaped oil reservoirs. The reservoirs develop in the
fault core and fracture zone, their reservoir space types are breccia interstitial pores, cavities and structural fractures
formed by cataclasis. (2) The ultra-deep fractured breccia reservoirs are initially deposited as tight lithofacies, with very
low pre-existing formation porosity and permeability, preserving a low amount of original formation water. There was no
significant dissolution of atmospheric water in the later stage, which led to the fractured reservoir bodies having the
characteristics of high oil column (up to one thousand meters) and being water-free or having little water content. (3) In
terms of geological understanding, detailed description of reservoirs and development methods, three aspects of
understanding transformation have been formed: from fault-controlled karst reservoir to fractured breccia reservoir, from
description of fault-karst oil reservoir to the internal structure description of fractured breccia oil reservoir, from water
injection development to gas injection development. |
| Keywords: ultra-deep; fractured breccia reservoir; core-zone structure; reservoir characteristics; Fuman Oilfield; Tarim
Basin |
|
投稿时间：
2025-06-30 |
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