莺歌海盆地东方区黄流组一段砂质碎屑流沉积模式

Sandy debris-flow sedimentary mode in Member1 of Huangliu Formation in Dongfang area of Yinggehai Basin

前人对莺歌海盆地东方区黄流组海底扇的沉积认识难以有效指导气田的开发生产,为解决这一难题,结合国内外重力流的最新研究进展及研究区开发生产实践,从岩心精细观察描述入手,结合分析化验、钻测井、地震资料,寻找典型重力流沉积构造特征,分析物源和水动力环境,重新厘定黄流组的沉积模式。研究认为,黄流组沉积处于莺歌海盆地低位域海退期,主要发育来自西部蓝江物源的砂质碎屑流,浊流发育较少;砂质碎屑流的平面展布形态主体受莺西坡折带的控制,同时受到北西—南东向底流作用的影响,砂体有顺底流方向展布的趋势且存在一定的不连续性。东方区黄流组储层从海底扇到砂质碎屑流认识的改变,为后期的气田开发提供了新的思路和方向,并对东方13-B气田总体钻井规划(ODP)实施及井位优化工作中起到指导作用。

The understandings of the sedimentation of Huangliu Formation submarine fan in Dongfang area of Yinggehai Basin are difficult to effectively guide the development and production of the gas field.In order to solve the problem,integrated with the latest research progress of the gravity flow at home and aboard and moreover the development production practice in the study area,started from the core fine observation and description,the sedimentary and structural characteristics of the typical gravity flow were sought by means of comprehensively analyzing the tested,drilling,logging and seismic data.And furthermore the provenance and hydrodynamic environments were figured out,the sedimentary model of Huangliu Formation was calibrated and determined once more.The study shows that Huangliu Formation sedimentation happened in the regressive period of the low system tract of Yinggehai Basin,the sandy debris flow from West Lanjiang provenance was mainly well developed while the turbidity current is less developed;the main planar distribution configurations of the sandy debris flow are controlled by Yingxi Slope Break Belt,at the same time,influenced by NW-SE bottom-current action,there is the distribution trend along the direction of the bottom current and furthermore with a little discontinuity.The change of the understandings from the submarine fan to the sandy debris flow has provided a new thought and direction to the late development of the gas field and moreover the guiding actions to the ODP implementation of DF13-B Gas Field and optimization of the well location.