Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (4): 571-577.doi: 10.11743/ogg20120411

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Differential tectonic evolution and hydrocarbon distribution in clastic strata of petroliferous basins in central-western China

Fang Chengming1,2, Huang Zeguang2, Duan Tiejun2, Hu Zongquan3, Yang Fan2   

  1. 1. School of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China;
    2. Wuxi Petroleum Geology Research Institute, SINOPEC PEPRIS, Wuxi, Jiangsu 214126, China;
    3. SINOPEC Exploration & Production Research Institute, Beijing 100083, China
  • Received:2012-02-12 Revised:2012-07-11 Online:2012-08-28 Published:2012-09-11

Abstract:

The relationship between tectonic evolution and hydrocarbon distribution is complex in major petroli- ferous basins such as Sichuan,Ordos,Junggar and Tarim in central-western China.Analysis of the tectonic evolution and late differential tectonic modification of these basins shows that the four basins had the similar process and different geologic timing of tectonic evolution and basin formation,i.e.they all have a similar basin-forming process featuring in transformation from extensional to compressional or transpressional basin.The late tectonic modification of the clastic strata is characterized by lateral aligning and vertical superimposition of three basic structural styles including foreland thrust,differential uplifts and titled structure.Tectonic activity,basin formation and late modification jointly control hydrocarbon accumulation types,sizesand distribution.Simple basin-forming process but diversified tectonic transformation determines that the four basins have similar play types but differential distribution patterns.The basic modification style of the four basins determines their hydrocarbon accumulation types,while the superposition features control the timing and sizes of hydrocarbon accumulation.Based on the understanding of the similarities and differences of tectonic controlling factors on hydrocarbon accumulation among these basins,we put forward a play classification scheme.According to this scheme,we identified 4 play types including palaeo-uplift,slope,foreland folded-thrust and large fault.

Key words: clastic rock, hydrocarbon accumulation, play, tectonic evolution, central-western China

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