莺歌海盆地海口29区下中新统三亚组一段洲-扇源-汇系统及沉积模式

Analysis of the delta-fan source-sink systems and sedimentary model of the first member of Sanya Formation in Lower Miocene in Haikou 29 Area, Yinggehai Basin

摘要

根据钻井、岩心、三维地震、测录井及分析化验资料,分析莺歌海盆地海口29区下中新统三亚组一段沉积类型、洲-扇源-汇系统,半定量描述三角洲前端海底扇输砂通道,明确研究区下中新统三亚组一段洲-扇源-汇系统及沉积模式。结果表明:研究区三亚组一段岩性以细砂岩与泥岩互层为主,砂岩发育鲍玛序列、变形构造、块状构造和冲刷面等重力流构造,属于海底扇沉积。在三角洲末端发育挠曲坡折,存在北支和东支输砂通道,输砂通道的大小和方向决定海底扇的大小和展布。根据源区三角洲、输砂通道、坡折带对沉积控制等,建立海口29区三亚组一段“洲-沟-扇”的洲-扇源-汇系统及“洲-沟-坡-扇”的沉积模式。该结果为莺歌海盆地深层砂体预测及勘探部署提供指导。

Abstract

According to the data of drilling, core, 3D seismic, well logging and laboratory analysis, the main factors of sedimentary type and delta-fan source-sink system of the first member of Sanya Formation in Lower Miocene in Haikou 29 Area, Yinggehai Basin are analyzed. The sand transport channel of submarine fan in the front of delta is described semi-quantitatively, and the delta-fan source-sink system and sedimentary model of the first member of Sanya Formation in the Lower Miocene are defined. The results show that the lithology of the first member of Sanya Formation is dominated by fine sandstone and mudstone interbeds. The sandstone develops gravity flow structures such as Bouma sequence, deformation structure, block structure and scour surface. The C-M diagram determines that it belongs to submarine fan deposition. The flexural slope break is developed at the front of the delta, and accompanied by north and east sand transport channels. The scale and distribution of the submarine fans is governed by the dimensions and orientation of these sand transport channels. Based on this, a continental fan-sink system of “continent-channel-slope-fan” in the Sanya Formation section of Haikou 29 Area is established by comprehensive of the source delta, sand transport channel and the control of sedimentation by slope bend zone. These results provide guidance for deep sand bodies prediction and planning exploration in the Yinggehai Basin.

关键词

洲-扇源-汇系统 / 沉积模式 / 莺歌海盆地 / 海口29区 / 下中新统 / 三亚组一段

Key words

delta-fan source-sink systems / sedimentary model / Yinggehai Basin / Haikou 29 Area / Lower Micene / the first member of Sanya Formation

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基金资助

中国海洋石油有限公司“十四五”重大科技项目(KJGG-2022-0404)