北部湾盆地乌石凹陷东部流沙港组物源分析

发布时间：2018-01-10 18:01

本文关键词：北部湾盆地乌石凹陷东部流沙港组物源分析　出处：《地球科学》2017年11期 　论文类型：期刊论文

【摘要】：乌石凹陷是北部湾盆地继涠西南凹陷之后又一极具潜力的产能接替区,探讨其物源供给对掌握砂体展布规律及源-汇体系研究具有重要意义.基于地震资料、新钻井资料、岩心、测试分析等,试图从地震反射特征、岩矿特征、重矿物组合特征、水动力特征等方面探讨乌石凹陷无露头、无源-汇组分对比条件下沉积源区分布特征.研究表明:(1)乌石凹陷东洼流沙港组不同构造部位岩石组分存在明显差异,可以分为两种类型,其中源自企西隆起的北部WS17-2和中部WS16-1井区长石含量相对高,结构成熟度中等-差,以长石岩屑砂岩为主,源自流沙凸起的南部WS22-7和WS22-9井区岩屑含量高,结构成熟度差-中等,以岩屑砂岩为主;(2)北部和中部井区电气石、赤褐铁矿含量高、石榴子石含量低,南部井区赤褐铁矿、石榴石、锆石含量高,电气石含量低,反映该区域受到不同性质母岩碎屑影响;(3)水动力特征方面,北部井区与南部井区具有相似的最大碎屑粒径(-2~-1Φ)和最大悬浮粒径(2~3Φ),跳跃组分低含量呈低斜度,显示近源杂乱沉积特征;中部WS16-1井区最大碎屑粒径0~1Φ,最大悬浮粒径3.6~4.0Φ,跳跃组分呈高含量高斜度,显示较好分选的远离物源沉积特征;(4)研究区砂岩分选磨圆差,塑性岩屑颗粒与基质含量较高,体现了小型凹陷的沉积充填特征.乌石凹陷流沙港组物源是小型裂陷盆地近源快速供给的典型代表,储层抗机械压实强度低,储层物性主要受机械压实与粘土含量的影响.
[Abstract]:Wushi sag is a potential productivity replacement area in Beibu Gulf basin after Wei Southwest Sag. It is important to study the distribution of sand bodies and source-sink system based on seismic data. New drilling data, core, test analysis and so on, this paper attempts to discuss no outcrop in Wushi sag from the aspects of seismic reflection characteristics, rock and mineral characteristics, heavy mineral assemblage characteristics, hydrodynamic characteristics, etc. The study shows that there are obvious differences in rock components in different structural parts of Dongwa Liushagang formation in Wushi sag, which can be divided into two types. The feldspar content in WS17-2 and WS16-1 well areas in the north and the central part of Kexi uplift is relatively high, the structure maturity is medium to poor, and feldspathic sandstone is the main source. The southern WS22-7 and WS22-9 well areas derived from quicksand uplift have high lithic content, poor structural maturity, and mainly lithic sandstone. (2) the tourmaline content of tourmaline is high in the northern and central well areas, and the content of garnet is low, and the content of garnet, zircon and tourmaline is low in the southern well area. The results show that the region is affected by the detritus of different parent rocks. (3) in terms of hydrodynamic characteristics, the northern well area and the southern well area have similar maximum detrital particle size (-2n-1 桅) and maximum suspended particle size (~ 2o ~ (3) 桅), and the low content of jump components is of low slope. Showing the characteristics of near-source clutter deposition; The maximum grain size of detritus is 0 ~ 1 桅 and the maximum suspended diameter is 3. 6 ~ 4. 0 桅 in the middle WS16-1 well area. The jumping components show high content and high slope, showing the characteristics of good separation away from the sediment source. (4) the sandstones in the study area have poor separation and grinding, and the content of plastic cuttings and matrix is high. The material source of the quicksand port formation in the Wushi sag is a typical representative of the rapid supply near the source of the small rift basin, and the mechanical compaction strength of the reservoir is low. Reservoir physical properties are mainly affected by mechanical compaction and clay content.
【作者单位】：中国地质大学构造与油气资源教育部重点实验室;中国地质大学资源学院;中海石油(中国)有限公司湛江分公司;
【基金】：国家“十三五”油气重大专项(No.2016ZX05024-006)
【分类号】：P512.2;P618.13
【正文快照】： 0引言2013年,中海石油(中国)湛江分公司在乌石凹陷流沙港组的勘探中取得了较大的突破和进展,层段内丰富的储量使其有可能成为继涠西南凹陷之后北部湾盆地第二个产能基地(柳永杰等,2008;徐新德等,2013;胡德胜等,2016;胡林等,2016;徐雪丰等,2016;曾小明等,2016).前人已对流沙港

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