Citation: | LIU Wei, YU Chuan-mou. CHARACTERISTICS OF FAULTS IN THE PU-WEI RING DEPRESSION AND ITS CONTRIBUTION TO MIGRATION AND ACCUMULATION OF OIL AND GAS[J]. Journal of Geomechanics, 2009, 15(2): 190-200. |
The Pu-Wei ring depression, with complex structures, has been poorly studied. Based on analysis on the faults, this paper deals with function of the faults in migration and accumulation of oil and gas. The research demonstrates that both the Pucheng-Chenying fault zone and the Weidong-Wendong fault zone consist of five master control faults, which control the structural formwork and migration and accumulation of oil and gas. The activity of such faults as Weidong, Wendong, Pucheng, Pu31 lasted a long period and match well with oil accumulation in age. The faults serve as a prominent way for oil migration from deep zone to superficial part. The faults and sand bodies of good connectivity, as the main migration pathway, together constitute the fault-type and fault-sand-type transforming system for oil and gas. The fault-type transforming system connects souce rock and reservoir and enhances the ability of vertical oil migration; and the fault-sand-type is chiefly helpful to lateral transforming. The faults block or regulate migration and its direction, leading to the formation of structural-stratigraphic hydrocarbon reservoir near the main faults and formation of lithologic hydrocarbon reservoir at the edge far away the main faults.
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Distribution chart of main faults in the Pu-Wei ring depression
The growth index and paleo-fall bar chart of the main faults in the Pu-Wei ring depression
Distribution of exceedingly high-mineralization water in Sha-2 Member in the Pu-Wei ring depression
A model for the fault-sand transforming system