埕海油田火成岩分布特征——以埕海DD区块为例

大港埕海油田埕海DD区块位于浅海地区,钻井资料相对较少,主要依靠地震资料来进行储层的预测。钻井资料显示该区发育连片的火成岩,在利用反演属性与地震属性方法未能准确识别火成岩范围的情况下,为了研究该区火成岩的分布特征,采用了相干体切片技术和变密度浮雕显示技术方法,即先识别火山通道再识别火成岩最后精细刻画火成岩分布范围。结合地震、测井、录井资料以及地质体切割率分析火山喷发时期、油气成藏模式后,研究结果表明研究区火成岩分布为受火山通道控制的条带状展布,火成岩对油气藏起到了遮挡圈闭的作用。通过对埕海DD区块火成岩分布特征的研究落实了埕海DD区块储层的边界,为研究区井网部署提供了重要的地质依据,降低了实施风险。

Study on The Distribution Characteristics of Igneous Rocks in Chenghai Oilfield-- Take Chenghai Block DD as an Example

The Chenghai DD block of Dagang Chenghai oilfield is located in the shallow sea shoal, the drilling data are relatively sparse. So the reservoir prediction mainly relies on seismic data. The drilling data show that there are continuous igneous rocks in this area. In the case that the inversion attribute and seismic attribute method can not identify the range of igneous rock accurately. In order to study the distribution characteristics of igneous rocks in this area, coherent body slicing technique and density-varying relief display technique are adopted. Firstly, the volcanic conduit is identified, then the igneous rocks are identified. And finally the distribution range of igneous rocks is accurately described.Combined with seismic, logging and logging data as well as geological cutting rate analysis of volcanic eruption period and oil and gas accumulation model, the research results showed that the igneous rocks in the study area were distributed in bands controlled by volcanic conduit, and igneous rocks played the role of occlusion trap for oil and gas reservoirs. By studying the distribution characteristics of igneous rocks in Chenghai DD block, the boundary of the reservoir in Chenghai DD block is implemented, which provides important geological basis for the well network deployment in the study area and reduces the implementation risk.