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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.
Wushi Depression is another potential successor to the Beibu Gulf Basin following the Xijinan Sag, so it is of great importance to study the source distribution of the source rock to understand the distribution of sand bodies and the source-sink system.Based on the seismic data, Data, core, test and analysis, trying to explore the distribution characteristics of sedimentary source area under the condition of no outcrop and passive - sink component in Wushi sag from the aspects of seismic reflection characteristics, rock and mine characteristics, heavy mineral assemblages and hydrodynamic characteristics. The results show that: (1) The rock components of the different structural parts of the Lvliao Saguang Formation in Wushi Depression are obviously different and can be divided into two types. Among them, the northern part of WS17-2 and the middle part of WS16-1 The rock content is relatively high, and the structural maturity is medium-poor, with feldspathic lithange sandstones mainly derived from high spallation in the southern WS22-7 and WS22-9 wells, with poor maturity - medium (2) the tourmaline and limonite in the northern and central wellbores are high, with low content of garnet, high content of limonite, garnet and zircon in the southern well, low tourmaline content , Reflecting the influence of rock fragments of different nature on this area; ( 3) In terms of hydrodynamic characteristics, the northern and southern wellbores have similar maximum particle size (-2 ~ -1Φ) and maximum suspended particle size (2 ~ 3Φ) Showing the features of near-source clutter deposition. The maximum clastic particle size in the central WS16-1 well ranged from 0 to 1Φ and the maximum suspended particle size ranged from 3.6 to 4.0Φ. The jumping component showed a high content and high gradient, indicating a better separation away from the source Sedimentary characteristics of the sandstone in the study area are poor, and the content of plastic lithic fragments and matrix is high, which shows the sedimentary filling characteristics of the small sags.The source of the Liushagang Formation in the Wushi Sag is near the source of the small rift basin The typical representative of supply, reservoir anti-mechanical compaction strength is low, the reservoir physical properties mainly by mechanical compaction and clay content.