珠江口盆地文昌13-1油田ZJ2-1U砂组沉积微相地震刻画

针对珠江口盆地文昌13-1油田井网稀疏，不同微相砂体厚度及组合特征差异等制约井间砂岩分布及沉积微相刻画的难题，从井点出发通过岩心资料确定了井点沉积微相类型；利用地震属性和地震相分析方法对沉积微相的平面展布规律进行了刻画。通过构建“地震基准弧长对数”属性，并利用该属性进行砂岩厚度定量预测，从而建立了研究区砂坪主体和砂坪侧缘的地震相模式；利用砂岩厚度分布和地震相落实了沉积微相边界。研究结果揭示，该区ZJ2-1U砂组沉积期经历了“泥坪-混合坪-砂坪”的沉积演化，砂坪主体呈北东向条带状展布，主要分布在研究区中、西部，砂坪侧缘面积大，呈互层状在全区分布。上述认识为油藏开发调整提供了地质依据。

Sedimentary micro facies characterization with seismic in Wenchang 13 1 Oilfield,Zhujiangkou Basin

It is very difficult to perform sedimentary micro-facies characterization with seismic in Wenchang 13-1 Oilfield, Zhujiangkou Basin due to sparse well net, different sand thickness, and different depositional micro facies. Here we propose an approach for sedimentary micro facies characterization in the area. First we determine sedimentary micro facies types based on core data. Then we characterize sedimentary facies with seismic attributes and seismic facies analysis. After that we develop a new seismic attribute named “logarithm of standard seismic arc length”, and use it for sandstone thickness quantitative prediction to build seismic facies models for sand flat main body and sand flat edge. Finally planar distribution of sandstone thickness and seismic facies are used to confirm sedimentary micro facies boundaries. It is concluded that after a sedimentary evolution sequence of “mud flat, mixed flat and sand flat”, sand flat main body distributes mainly in the middle and west of the study area, and sand flat edges are developed as thin inter-beds in the whole area. This study provides good geologic basic knowledge for further oil development.