济阳坳陷石油控制储量升级特点

控制储量升级已成为济阳坳陷探明储量最重要的来源。勘探增加、老井复查与测试技术进步是济阳坳陷石油控制储量升级的主要原因,储量规模、储量丰度、产能、油藏埋深是影响控制储量区块升级的重要因素。一般情况下,储量规模大于500×10⁴ t、储量丰度大于50×10⁴ t/km²、油藏埋深小于3 500 m、千米井深稳定产量大于2.8 t/km·d(陆地)或20 t/km·d(浅海)的石油控制储量区块基本可升级为石油探明储量。     

断层性质随深度变化的定量判断方法

声波在岩石中的传播速度与岩石的性质、孔隙度以及孔隙中所充填的流体性质密切相关,因此可以利用声波在断层岩中传播的时差异常来分辨断层的力学性质。通过对东营凹陷的砂泥岩和其间断层岩的声波时差随深度变化特征及其相互间关系研究,进一步揭示张性断层声波时差异常的变化幅度和异常范围与断层埋藏深度有关。在1600m左右以上区段,断层带的声波时差比围岩要大,断层为开启性质,断层对油气不具有封闭作用;在1600m以下区段,断层带的声波时差比围岩要小,为压性断层性质,断层处于封闭性状态,断层对油气具有封闭作用。     

库车坳陷秋里塔格构造带构造变形控制因素及分段特征

秋里塔格构造带是库车坳陷最重要的油气接替勘探领域,受古隆起控制,中生界沉积变化快,南天山冲断体系构造发育空间受限,两套滑脱层分布差异大,东、西两段构造变形特征明显不同。依据构造样式和油气勘探特点差异,秋里塔格构造带可分为两大段——西秋段和东秋段,可进一步细分为五小段——佳木段、西秋西段、西秋东段、东秋段和迪那段,不同段的油气勘探方向不同。     

渤海湾盆地含油气凹陷压力场特征及与油气富集关系

含油气盆地不同类型凹陷地层压力场具有明显差异,压力场与油气富集关系密切。以渤海湾盆地含油气凹陷实测地层压力资料为基础,探讨了含油气凹陷压力场类型及分布特征,以及超压与生烃作用、压力场与油气富集等关系。研究表明,渤海湾盆地含油气凹陷新生界纵向压力场大致可归为3类,即常压型、单超压型、双超压型;不同类型压力场凹陷的分布具有分区性：常压型多分布于盆地外围凹陷,单超压型在盆地广泛分布,双超压型主要分布于环渤海地区。生烃作用对凹陷超压的形成具有重要影响,超压层系与主力生烃层系相对应,凹陷充填演化历史及主力生烃层系的差异可能是形成3类凹陷压力场的主要原因。凹陷生烃层系超压与油气富集关系密切：平面上油气围绕超压中心分布,超压程度影响油气二次运移距离;纵向上油气富集层系受凹陷压力场类型控制,常压型凹陷油气主要富集于生烃层系及紧邻层系,单超压型凹陷油气富集于生烃层系及上下多套层系,而在双超压型凹陷,新近系油气富集程度较高;生烃层系超压程度影响凹陷油气富集程度,富油凹陷均为超压幅度较大的凹陷。     

流动单元划分在沾化凹陷灰质储层评价中的应用

根据流动单元划分的基本思路,针对沾化凹陷沙四段的灰质储层特点,结合岩心、铸体薄片以及开发资料等数据,对流动单元内部的岩石物理相进行了分析,提出了适合该类储层评价的流动单元划分方法,并结合实际产能资料对该区灰质储层进行了评价。     

冀中坳陷晋县凹陷南部古近系沙四段－孔店组层序地层研究及油气勘探方向

充分利用已有的地震、钻井、测井、分析化验资料,应用层序地层学理论对晋县凹陷南部古近系沙四段一孔店组地层开展系统的层序地层学研究,建立了凹陷内不同位置的沉积模式,并对沉积相带展布及演化特征进行了分析,明确了下步油气勘探的有利方向。研究表明,晋县凹陷南部沙四段-孔三段为一个二级层序,其间可划分为3个三级层序、8个四级层序;发育有冲积扇、三角洲、扇三角洲、近岸水下扇及冲积平原5种沉积相类型;形成岩性类和构造一岩性类2个油气富集区,是下步油气勘探的重点区带。     

塔里木盆地西南坳陷苏2构造建模

由于受资料的限制,塔里木盆地西南坳陷苏2构造的构造模型具有多解性,直接影响苏2构造的油气勘探。结合前人研究成果和地质露头、地震、钻井资料,建立起该区带的构造模型,获得以下认识：山前断层为基底卷入断层,断层产状由山前向盆地、由深部向浅部逐渐变缓,泥盆系等较老地层逆冲于苏2背斜之上;苏2构造不但有可能存在下白垩统,而且还可能有侏罗系。     

潜江凹陷北部潜江组成藏动力系统划分及成藏模式

潜江凹陷北部潜江组是江汉盆地油气勘探与研究的重点,蕴藏着较为丰富的石油资源,但对其油气成藏缺乏系统、深入的研究,制约了勘探的进程.运用成藏动力学理论和方法对潜江凹陷北部潜江组的成藏动力系统进行研究和划分.以构造—沉积演化的阶段性与旋回性为基础,结合生储盖组合、地层压力系统、油源特征和封闭程度将研究区潜江组划分为底部自源超压半封闭成藏动力子系统、下部混源超压半封闭成藏动力子系统、中部混源弱超压半封闭成藏动力子系统和上部他源常压半开放成藏动力子系统.总结出潜江凹陷北部潜江组的3种成藏模式,分别为自源—砂体—侧向成藏模式、混源—断层—砂体—垂向—侧向成藏模式和他源—断层—砂体—垂向—侧向成藏模式.     

Genetic mechanisms of secondary pore development zones of Es<Stack><Subscript>4</Subscript><Superscript>x</Superscript></Stack> in the north zone of the Minfeng Sag in the Dongying Depression,East China

The genetic mechanisms of the secondary pore development zones in the lower part of the fourth member of the Shahejie Formation (Es4 x) were studied based on core observations, petrographic analysis, ?uid inclusion analysis, and petrophysical measurements along with knowledge of the tectonic evolution history, organic matter thermal evolution, and hydrocarbon accumulation history. Two secondary pore development zones exist in Es4 x, the depths of which range from 4200 to 4500 m and from 4700 to 4900 m, respectively. The reservoirs in these zones mainly consist of conglomerate in the middle fan braided channels of nearshore subaqueous fans, and the secondary pores in these reservoirs primarily originated from the dissolution of feldspars and carbonate cements. The reservoirs experienced ‘‘alkaline–acidic–alkaline–acidic–weak acidic’’, ‘‘normal pressure–overpressure–normal pressure’’, and ‘‘formation temperature increasing–decreasing–increasing’’ diagenetic environments. The diagenetic evolution sequences were ‘‘compaction/gypsum cementation/halite cementation/pyrite cementation/siderite cementation–feldspar dissolution/quartz overgrowth–carbonate cementation/ quartz dissolution/feldspar overgrowth–carbonate dissolution/feldspar dissolution/quartz overgrowth–pyrite cementation and asphalt ?lling’’. Many secondary pores (fewer than the number of primary pores) were formed by feldspar dissolution during early acidic geochemical systems with organic acid when the burial depth of the reservoirs was relatively shallow. Subsequently, the pore spaces were slightly changed because of protection from early hydrocarbon charging and ?uid overpressure during deep burial. Finally, the present secondary pore development zones were formed when many primary pores were ?lled by asphalt and pyrite from oil cracking in deeply buried paleoreservoirs.     

A SEMI-CIRCLE THEOREM FOR UNSTABLE PERTURBATION IN TROPICAL CYCLONE-SCALE VORTICLES

In this paper, we discusses the spectrum distribution of baroclinic disturbances in tropical cyclone-scale vortices with the assumption that the basic flow does not vary with height. The semi-circle theorem for the unstable perturbation is obtained and the upper bound of growth rate can be estimated. The upper bound of instability growth rate increases with the increase of the maximum basic-state tangential wind speed, angular speed, inertial parameter, absolute vorticity, radial gradient of absolute vorticity and static stability. The upper bound of instability growth rate is greater for vortices of larger horizontal scale and smaller vertical scale and lower wave-number disturbances.