Characteristics of the Paleo-Stress and Significance of Petroleum Geology in the Southwestern Margin of Xuefeng Uplift

• 1、Basin & Reservoir Research Center, China University of Petroleum
• 2、Southern Exploration Division Company, SINOPEC

Abstract：Based on the geological survey, balanced cross-section analysis and regional tectonic evolution, we take advantage of rock acoustic emission information to restoring the maximum paleo-stress in the southwest margin of Xuefeng Uplift; besides this, we discuss the relationship between the maximum paleo-stress and hydrocarbon accumulation and damage. The results show that there are five key structural reforms in the study area, which has underwent a different frequency and intensity of acoustic emission of the in the movement. In the early Paleozoic and Indosinian cycle, the tectonic movement is weak, and the rock has acoustic emission once, whose maximum paleo-stress is 13.3MPa and 24MPa, moreover the Majiang ancient reservoir is in the mainly accumulation period; the high frequency and intensity paleo-stress correspond to the Majiang ancient reservoir’s reservoir comes into being or destruction. The single Neopaleozoic acoustic emission whose maximum paleo-stress is 92.6MPa means the reservoir comes into being. The five acoustic emissions in the phase of Yanshan and Himalayan, from the 23.3MPa to 74.4MPa, means the period of extensive destruction of ancient reservoir.

Keywords： acoustic emission paleo-stress ancient reservoir petroleum geology Xuefeng Uplift