扎尔则油田泥盆系F4层沉积相分析

Analysis of sedimentary facies of F4 layer in Devonian in Zarzaitine Oilfield

沉积相分析是油田开发中后期精细油藏描述的内容之一,是为储层参数测井解释、储层非均质评价和剩余油分布研究等方面提供基础。从岩心描述入手,结合区域地质背景、岩心分析和测井等资料,应用沉积岩石学、沉积物重力流地质学、测井地质学和岩相古地理学等理论,在对沉积特征进行综合分析的基础上,对扎尔则油田泥盆系F4层沉积成因及其演化过程进行了研究。认为扎尔则油田泥盆系F4层的沉积相是海洋环境下重力流沉积形成的水下扇,从下到上为一海退—海进沉积序列。

Sedimentary facies analysis is one of the basic researches on fine reservoir description at the mid and later stages in oilfield development , with the purpose of providing the foundation for log interpretation of reservoir parameters,evaluation of reservoir heter-ogeneity and research on remaining oil distribution. Starting with core description and integrating with regional geological setting, core analysis and logging data,we make a thorough study on the origin and evolution of F4 layer in Devonian in Zarzaitine Oilfield based on the integrated analysis of depositional features with the theories of sedimentary petrology, sediment gravity flow geology, logging geology and lithofacies palaeogeography. It is considered that F4 layer is a submarine fan generated by gravity flow in marine environment, with a regressive-transgressive sequence from the lower to the upper parts.