惠州凹陷深层非常规致密油气藏分布规律不清、顶底界限不明,严重影响勘探开发进程,针对该问题,以测井、试油、高压压汞等资料为基础,综合采用储层物性统计分析和实例剖析法确定研究区浮力成藏下限,采用最小流动孔喉半径法和储层内外势差法确定油气成藏底限,对惠州凹陷自由流体动力场和局限流体动力场进行划分,明确非常规油气藏分布界限.研究结果表明:惠州凹陷浮力成藏下限为3 500-4 000 m,对应孔隙度为8.50％,渗透率为1.00 mD;油气成藏底限临界孔喉半径为0.032 5 μm,临界孔隙度为1.72％-2.00％,对应的深度底限为6 000-6 500 m.研究结果为惠州凹陷开拓新的油气勘探领域,寻找新的油气勘探目标和接替资源指明了方向.

珠江口盆地陆丰凹陷古近系油气成藏受多种动力多种要素联合控制,因此不能完全依照经典的浮力成藏理论预测有利成藏区带.通过剖析研究区已经发现的油气藏揭示出三种动力对油气成藏起到了关键作用,包括低位能(背斜类油气藏)、低压能(断块类油气藏)、低界面能(岩性地层类油气藏);在每一种动力作用下,油气成藏受到有效烃源层、优相储层、区域盖层、低势区带4个功能要素及其时空组合的控制.通过建立多动力-多要素复合成藏模式,对陆丰凹陷古近系4个目的层有利成藏区带进行了预测评价,优选出10个最有利目标,为研究区油气深化勘探和钻探目标优选提供了科学依据.

As the focus of conventional oil and gas exploration is changing from shallow to deep layers, the identification of deep effective reservoirs is crucial to exploration and development. In this paper, based on the geological anatomy of oil and gas reservoirs, a new discriminatory criterion and evaluation method for effective reservoirs is proposed in combination with the analysis of reservoir formation dynamics mechanism. The results show that the hydrocarbon properties of the reservoir vary with the ratio of the capillary force between the sandstone reservoir and its surrounding rock. The effective reservoir is discriminated and the reservoir quality is evaluated based on the capillary force and depth of the surrounding media and the sandstone reservoir for adjacent plates. When the capillary force ratio is greater than 0.6, fewer effective reservoirs are developed. The effective reservoir is determined by the capillary force ratio of the sandstone reservoir and the surrounding rock medium to mechanically explain the geological phenomenon that low-porosity reservoirs can also accumulate hydrocarbons. Our findings have significant guiding value for Paleogene oil and gas exploration in the Zhu I depression of Pearl River Mouth Basin.

Saline shales are widely developed in the Mesozoic and Cenozoic continental saline lacustrine rift basins in China， containing abundant shale oil resources. The development of sweet spots in shale oil plays is closely related to the organic matter richness， but the key factors controlling differential enrichment of organic matter in saline shales are still unclear few and controversial. Taking the Dongpu Depression in the Bohai Bay Basin as an example， this study conducted the TOC， FE-SEM， energy spectrum， major， trace， and rare earth elements analyses on the Es3 （Third member of the Paleogene Shahejie Fm） Shales， exploring the correlations among the organic matter richness with paleoclimate， paleo-salinity， sedimentation rate， paleo-productivity， and redox condition. Results show that the organic matter enrichment degree is jointly controlled by paleo-productivity， paleo-salinity and sedimentation rate. The greater the paleo-productivity is， the greater the organic matter enrichment degree is. With the increasing paleo-salinity and sedimentation rate， the organic matter enrichment degree increases first and then decreases. Redox conditions have little effect on the enrichment of organic matter， which is mainly related to the generally strong reduction condition of the shale cores. The combination of high paleo-productivity， proper paleo-salinity and proper sedimentation rate is most favorable for the organic matter enrichment. Differential enrichment of organic matter within shales is one of the important contents for Unconventional Petroleum Sedimentology studies. Revealing the key factors controlling differential enrichment of organic matter is of great significance to the exploration and development of lacustrine shale oil in China.

<正>"打通拦门沙,治理长江口"这个几代港航界志士仁人的百年梦想今日终于实现。3月14日,长江口深水航道治理三期工程顺利通过交工验收。交通运输部也正式对外宣布:长江口深水航道三期工程12.5m水深全线贯通。作为我国这项迄今为止的最大水运工程,在