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以钻井、三维地震等资料为基础 ,运用高精度层序地层学理论及方法 ,建立了沾化凹陷层序地层格架 ,划分出 1个一级层序、4个二级层序、17个三级层序、5 1个体系域、70个准层序组和 10 9个准层序。根据地震反射终止结构特征、准层序组叠加方式的转换和岩性剖面 ,识别出层序边界、首次洪泛面和最大洪泛面等关键界面。根据准层序组的叠加型式及地震相区分沉积体系类型 ,恢复了沉积体系。在层序地层格架内 ,低位体系域沉积体系类型丰富 ,以三阶坡折控制的冲积扇 -扇三角洲 (三角洲 ) -低位楔 -低位扇为特征 ;水进体系域和高位体系域的沉积体系具有继承性。每个体系域的沉积体系组合具有成因上的连续性。强烈断陷期发育的沉积体系与不整合面、断层面相配置的地区是油气勘探的有利区带。
Based on the data of drilling and 3D seismic, using the theory and method of high-precision sequence stratigraphy, the sequence stratigraphy framework of Zhanhua sag has been set up, and one first-order sequence, four second-order sequences, 17 Three-level sequence, 51 system tract, 70 quasi-sequence group and 109 quasi-sequence. According to the characteristics of the termination structure of seismic reflection, the conversion of quasi-sequence group superposition mode and the lithologic profile, the key interfaces of sequence boundary, first flood surface and maximum flood surface are identified. According to the superimposed type of quasi-sequence group and the distinction of sedimentary system types by seismic facies, the sedimentary system was restored. In the sequence stratigraphic framework, the sedimentary system of lowstand system tract is rich in type, and is characterized by alluvial fan-fan delta (delta) -low wedge-lowstand fan controlled by third-order slope collapse. The deposition of water into system tract and highstand system tract The system has inheritance. The depositional system combination for each system tract has an ingenuity of continuity. The sedimentary system and the unconformity developed in the strong fault depression period and the area configured by the fault plane are the favorable zones for oil and gas exploration.