Organization
International (Chad) Company Limited, CNPC, Beijing 100043, China
Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China
Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China
College of Geosciences, China University of Petroleum, Beijing 102249, China
Abstract
This paper analyzes in detail the working principles, working process, insufficiency and influence factors of paleostructure restoration accuracy and puts forward to the method of drawing paleostructure contour map under the control of balanced section. The study suggests that the structure map called for "before deposition of one member" is the reflection of the structural rolling shape of bottom surface after the member deposition and it is not one time′s surface configuration. It is the superimposing result of all deformations during the whole time. Dipping strata, well deflection, difference denudation and horizontal shift of faults are the dominant influence factors of paleostructure restoration accuracy. The influence of sedimentary compaction is relatively small and the influence of paleo-bathymetry is the least which can be ignored. Thickness value can be read with the balanced section control method based on stratum lapping, horizontal shift of faults restoration and the influence of difference denudation and compaction. It can exactly demarcate the location of paleofaults and more accurately express 3-D structural configuration in the period of geologic history.
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