Xinjiang Petroleum Geology ›› 2020, Vol. 41 ›› Issue (6): 651-657.doi: 10.7657/XJPG20200603

• OIL AND GAS EXPLORATION • Previous Articles     Next Articles

Structural Style and Evolution of Northern Piedmont Belt in Turpan-Hami Basin

HUANG Diefang(), JIANG Menglei, SHAO Manjun, LIN Lin, CHENG Tian, LI Chengming, LIU Juntian   

  1. Research Institute of Exploration and Development, Tuha Oilfield Company, PetroChina, Hami, Xinjiang 839009, China
  • Received:2020-05-05 Revised:2020-09-04 Online:2020-12-01 Published:2020-12-02

Abstract:

Complex geological structures and poor quality of seismic data make the northern piedmont belt difficult to be explored in the Turpan-Hami basin. In order to make new breakthroughs in oil and gas exploration, geological, seismic and drilling data is used to describe structural styles, conduct structural physical simulation to correct structural interpretation, and establish a more reasonable and accurate structural model to systematically analyze the mechanism and law of the structural deformation in the study area. The results show that double decollement layers (Jurassic coal seam and Permian mudstone) are developed in the northern piedmont belt and thrust nappe structures dominated by imbricated structures form, where zigzag thrust faults, protuberances and imbricated fans can be found vertically. Under the detachment layers, there are double stacked structures or double imbricated structures. In the plane, the piedmont belt is controlled by two groups of faults and the study area is divided into 3 rows of structural belts including thrust belts, overthrust belts and structural belts at the outer edge of the overthrust belts from north to south. The fault anticline and fault-block structural groups in the footwall of the nappe in the middle-east section of the study area are well developed with complete morphology, which are favorable for oil and gas preservation, and are the targets for risk exploration of Jurassic oil and gas. The structural belt at the outer edge of the overthrust belt with relatively complete morphology is a potential target for oil and gas exploration in the Lower Jurassic and its underlying strata.

Key words: Turpan-Hami basin, northern piedmont belt, structural modeling, structural style, double structure, tectonic evolution

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