黄河口凹陷古近系火成岩特征及构造影响分析--以BZ34-9油田为例  

Characteristion and Tectonic Influence of Paleogene Igneous in Huanghekou Sag--Taking BZ 34-9 Oilfield as an Example

作　　者：张立安 ZHANG Li’an(Tianjin Branch of CNOOC Limited,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《广东石油化工学院学报》2022年第6期5-8,共4页Journal of Guangdong University of Petrochemical Technology

基　　金：中国海洋石油有限公司综合科研项目(YXKY-2015-TJ-01)。

摘　　要：渤海海域黄河口凹陷于古近纪时期广泛发生火山喷发活动,砂岩储层与火成岩交织分布形成复杂地质体,主要含油目的层段内部和上覆地层均有火成岩发育,其岩性多样、分布广、厚度不均,引起局部层段地层速度异常,给时深转换带来较大误差,给构造落实和井位部署带来诸多不确定性,风险较大。研究中针对目的层段构造成图,提出了一种去火成岩影响的时深转换新方法。在研究区火成岩岩性、岩相及地震反射特征分析的基础上,对上覆地层火成岩速度进行分析,运用正演模型作指导,分析目的层平均速度与火成岩发育的关系,建立平均速度场。在地震层位精细构造解释的基础上,进行时深转换,最终得到研究区更为合理的构造解释成果。为油田储量计算和井位部署奠定了基础。Volcanic eruptions occurred widely in the Huanghekou Sag in Bohai Sea during Paleogene.Now sandstone reservoirs and igneous rocks are interwoven to form complex geological bodies.Igneous rocks are developed in the main oil-bearing target intervals and overlying strata.Their lithology is diverse,widely distributed and uneven in thickness,which causes abnormal formation velocity in local intervals,brings great errors to time-depth conversion,and brings many uncertainties and risks to structural implementation and well location deployment.Aiming at the structural mapping of the target interval,a new method of time-depth conversion to remove the influence of igneous rocks is proposed.Based on the analysis of lithology,lithofacies and seismic reflection characteristics of igneous rocks,the velocity of igneous rocks in overlying strata is analyzed,and the relationship between the average velocity of target strata and the development of igneous rocks is explained by forward model,thus the average velocity field is established.On the basis of fine structural interpretation of seismic horizon,time-depth conversion is carried out,and finally more reasonable structural interpretation results are obtained in the study area.As a result,it lays a foundation for oilfield reserve calculation and well location deployment.

关 键 词：火成岩 发育模式 地层速度 构造校正 时深转换 

分 类 号：TE122[石油与天然气工程—油气勘探]