Study on Segmental Growth Characteristics of Main Faults in Southern Aer Sag

¹ Northeast Petroleum University, School of Earth Sciences, Daqing 163318, Heilongjiang, China
² Huabei Oilfield Company, Exploration and Development Research Institute, Renqiu 062552, Hebei, China

Abstract

The segmental growth of faults plays an important role in controlling oil and gas. This time, the southern part of the Aer sag is taken as the main research object to analyze the growth process of the faults. This paper uses the fault distance-distance curve, the fault distance-buried depth curve and the growth index to study the active stage of the segmental growth of the fault. The maximum fault distance subtraction method is used to strip back the faults, restore the ancient faults, and clarify the development characteristics of the main faults in each period. It is concluded that the Altala fault is a three-segment growth fault, and the fault continued to act during the depositional period of the A3 to Teng2 members, and the activity of the A4 was the most intense. The Hanwula fault is a two-segment growth fault. The faults continued to move during the depositional period of the A4 to Teng2 members, and the fault activity was most intense in the upper Teng1 sub-member. Hanwu Ladong belongs to a two-stage segmental growth fault, and the faults continued to be active during the strata depositional period from the first sub-member of Teng 1 to the second member of Teng 2, and the fault activity was most intense in the first sub-member of Teng. This study enriches the theory of the structure of the Erlian Basin's Aer sag and supports further breakthroughs in oil and gas exploration.