断阶型潜山带地质模型的建立及储层预测——以CG20潜山为例

以 CG2 0潜山为例 ,从建立地质模型入手 ,包括地层模型、构造模型、储集模型、储盖组合模型、速度模型等 ,认识到各套地层分布和储层物性的差异均与地震响应密切相关 ,因此可以利用地震波的信息 ,预测潜山储层的发育及分布情况。在对 CG2 0潜山进行精细全三维构造解释的基础上 ,探讨性地应用了测井约束反演、吸收系数、相干分析及三维模式识别等技术 ,对潜山储层进行了预测 ,从而提高了潜山勘探的效益 ,并为类似断阶型潜山带的勘探提供了成功的经验 ,具有一定的指导意义。

北部湾盆地徐闻探区南部断阶带水下扇体的识别与解释

北部湾盆地徐闻探区南部断阶带,地震资料品质较差。综合区域地质背景和单井岩心相分析认为,南部断阶带为近岸水下扇沉积。在建立该区层序地层格架的基础上,通过剖面分析、速度分析、时频及相干性分析等多种技术手段刻画近岸水下扇体,包括水下扇的期次、形态、范围及发育情况,最终在徐闻探区南部断阶带涠洲组识别出6期扇体。扇体的扇根和扇中互相叠置,扇根为盖层和遮挡层,扇中为储层,可形成有利的储盖组合,作为徐闻探区下步勘探的有利区带。

陡坡带砂砾岩扇体油气成藏特征——以济阳坳陷为例

由于陆相断陷湖盆陡坡带特殊的构造背景,其沉积地层中各种成因的砂砾岩扇体极为发育,是油气勘探的重要目标。以济阳坳陷为例,按成因把陡坡带分为断阶型陡坡带和单断型陡坡带2种类型,并研究了不同类型陡坡带砂砾岩扇体的类型,油气控制因素及分布规律。在此基础上,总结了一套以综合地质分析为基础,以地震、测井等新技术为手段的陡坡带砂砾岩扇体综合勘探方法,对类似陆相断陷湖盆陡坡带砂砾岩扇体的勘探,具有重要的指导意义。

蒙古前巴音盆地上白垩系沉积特征及富水性分析

蒙古前巴音断陷盆地位于蒙古国苏赫巴托尔省东南额尔敦查干县境内,该盆地为干旱———半干旱内陆断陷湖盆。运用层序地层学的基本原理,对湖盆内地层的沉积体系、沉积相及其地层层序进行了划分,并分析和研究了含水砂体(含水层)的分布规律,得出了富水带在湖盆横向上沿断阶型坡折带呈条带状分布,在纵向上分布于河流冲洪积扇和湖盆边缘,也是供水井的首选区域和供水勘探的重点区域。

A Prelude Staircase to a Type V Intermittency in Two—Dimensional Discontinuous Maps

A sequence of periodic attractors has been observed in a two-dimensional discontinuous map, which canbe considered as a model of impact oscillator. The so-called 'transfer number', which is defined as the mean numberof transfer from non-impact state to impact state per iteration, is locked onto a lot of rational values to form a curveconsisting of many steps. Our numerical investigation confirms that every step is confined by conditions created by thecollision between the periodic orbit and the discontinuous boundary of the system. After the last collision the systemshows a chaotic motion with intermittent characteristics. Therefore the staircase can be addressed as a 'prelude staircaseto type V intermittency'. The similar phenomenon has also been observed in a model of electric circuit. These resultsof our study suggest that this kind of staircases is common in two (or even higher) dimensional discontinuous maps.