河南濮城油田沙二上2+3砂层组末端扇沉积特征及剩余油分布          下载免费PDF全文

李红南  于文文  刘伟 《沉积与特提斯地质》2012,32(4):29-33

本文以濮城油田沙二上2+3砂层组为例,分析了末端扇储层的沉积特征,建立了末端扇沉积模式,确定了剩余油分布.末端扇储层分为近端亚相、中部亚相和远端亚相,中部亚相的分流河道微相是主要储集砂体.剩余油平面上主要集中在分流河道侧翼过渡区及近水道漫溢、远水道漫溢和分散的井网难控制的小透境体中,垂向上集中在正韵律顶部和反韵律底部等物性差的地方.二砂组主要富集在S23、S24小层的近气顶区,三砂组主要富集在S34、S35小层的濮53、文17断块构造高部位及注采不完善的地区.  相似文献   

Sedimentary Crust and Metallogeny of Granitoid Affinity: Implications from the Geotectonic Histories of the Circum‐Japan Sea Region,Central Andes and Southeastern Australia     

Kohei Sato 《Resource Geology》2012,62(4):329-351

Metallogeny of granitoid affinity was reviewed from the aspect of geotectonic history of the continental crust, particularly of the genesis of sedimentary crust involved in magmatism. The redox state of granitoids and related mineralization shows a remarkable contrast between the east and west sides of the Pacific Rim, but if examined closely, the reduced‐type and oxidized‐type granitoid provinces are juxtaposed in three regions: the circum‐Japan Sea region, the central Andes, and the Lachlan Fold Belt in southeastern Australia. Comparative study of these regions revealed that the reduced‐type magmatism associated with Sn mineralization generated in thick sedimentary crust which formed in three geotectonic environments: (i) accretionary terrane along a subduction zone (e.g. Jurassic East Asia), (ii) continental rift (e.g. Early Paleozoic Andes), and (iii) mega‐fan (e.g. Early Paleozoic southeastern Australia). A collisional orogen can provide large amounts of clastic sediment to these environments. The age gap between the magmatism and sedimentation varies depending on the tectonic evolution of individual regions. Thin sedimentary crust may not play an essential role for the reduced‐type magmatism. The oxidized‐type magmatism associated with porphyry Cu and other mineralization generated in the crust which was initially carbon‐free igneous crust or modified from sedimentary crust by magmatism. Subduction‐related basaltic magmas are relatively oxidized, and may enhance fO₂ conditions of granitoid activity. Repeated magmatism in a monotonous convergent margin may be favorable for porphyry Cu mineralization as exemplified in the eastern Pacific Rim.  相似文献   

西藏尼玛北部新生代盆地沉积记录及控盆机理     

黄辉  朱利东  杨文光  杨林  武景龙  董煜  周小琳 《地质通报》2012,31(6):936-942

通过野外地质调查和地层对比,将尼玛北部盆地新生代陆相地层定为牛堡组。根据岩石组合和沉积特征分析,尼玛北部盆地牛堡组可划分为扇三角洲相、湖泊相和冲积扇相。扇三角洲相可进一步划分为扇三角洲前缘和前扇三角洲2种亚相;湖泊相可划分为半深湖—深湖和滨湖—浅湖2种亚相。盆地的演化特征可分为盆地形成初始期、盆地扩张期和盆地萎缩期,3期的演化可分别对应牛堡组的一段、二段和三段。尼玛北盆地发育的各个阶段都跟古气候变化和构造活动有很大的联系,两者共同影响着盆地发育的各个阶段。结合前人的研究资料,认为尼玛盆地的发育时代为早白垩世末期—晚白垩世初。根据盆地边缘相与半深湖—深湖沉积相伴生、牛堡组底部发现火山岩夹层等沉积特征,可以推断尼玛盆地是一个具有走滑拉张性质的盆地。  相似文献   

东胜煤田锡尼布拉格勘查区煤层对比     

石彦强  邢立杰  薛鲜群 《中国煤炭地质》2012,(8):16-22

东胜煤田锡尼布拉格勘查区主要含煤地层为中侏罗统延安组,含煤层层数较多,且钻孔间距较大,煤层对比难度较大。根据区内勘查成果结合区域资料,采用煤层组合宏观结构、沉积旋回、地震波阻抗追索、测井曲线特征、标志层、煤层间距及煤层结构对比法等综合手段进行煤层对比,使3-1、4-1、4-2、5-1、5-2主要可采煤层达到对比可靠,3-2、3-3、4-1下等次要可采煤层和不可采煤层达到对比基本可靠的程度。  相似文献   

黄河三角洲的沉积动力分区     

任韧希子  陈沈良 《上海国土资源》2012,33(2):62-68

以2000年及2007年黄河三角洲滨海区采集的123和155个表层沉积物样品为数据基础,经实验室分析取得各样品的粒度参数,结合地貌条件、动力条件和水深资料,探讨黄河三角洲滨海区沉积物的分布类型、粒度特征以及其动力分区等方面的规律。黄河三角洲滨海区表层沉积物类型主要为砂质粉砂;中值粒径由岸向海逐渐变细;分选系数整体偏高反映了的复杂性;偏态值均为正,其极高值大都分布于水深10m左右的区域;峰态的极大值分布于现行河口的南侧,极小值分布于湾湾沟口和飞雁滩以东的近岸。Flemming三角图反映出冲蚀区的动力条件整体较强;淤积区内清水沟老河口附近的动力条件比现行河口强;浅海平原区水动力较弱且单一。  相似文献   

华北克拉通典型拗拉槽中—新元古界沉积体系与古地理演化     

吕奇奇  罗顺社  汪泽成  王铜山  张严  官玉龙 《地质学报》2022,96(2):349-367

中新元古界的油气资源潜力业已引起国际地质界的密切关注.近年来,新的钻探资料证实,华北克拉通中新元古代发育多个克拉通内拗拉槽,且拗拉槽内发育多套优质烃源岩及生储盖组合,显示具有巨大的油气勘探潜力.本文以华北克拉通东北缘燕辽拗拉槽和南缘熊耳拗拉槽中 新元古代地层为研究对象,以6条典型基干剖面实测、9条重点辅助剖面观察、3口...  相似文献   

珠江口盆地西江凹陷南部文昌组层序地层及沉积体系研究   总被引：2，自引：0，他引：2  

吴宇翔  柳保军  丁琳  谢世文  李小平  舒誉  刘冬青  王宇辰  郭伟 《海洋地质与第四纪地质》2022,42(1):146-158

珠江口盆地西江凹陷南部包括两个相邻洼陷:西江36洼和番禺4洼,钻探结果却揭示了截然不同的油气勘探前景,其中,番禺4洼探明储量已过亿吨,而西江36洼却未有商业发现,导致勘探上对西江36洼烃源潜力有所顾虑.为了揭示这种差异油气地质条件产生的原因,亟待开展两个洼陷的对比研究.以主要烃源层系文昌组为切入点,通过开展精细的层序-...  相似文献   

Dynamic responses of a sediment-filled valley with a fluid layer subject to incident waves     

Wen-I Liao 《地震工程与工程振动(英文版)》2011,10(2):175-185

The diffraction of elastic waves by a sedimentary valley in a homogeneous elastic half-space is studied in this paper. The sediment-filled valley is composed of a fluid layer over a soft soil deposit whose characteristics may be significant and should be carefully considered when designing long span bridges with high piers. The method of analysis adopted in the paper is to decompose the problem into an interior region and an exterior region. In the exterior region, the scattered wave fields are constructed with the linear combinations of two independent sets of Lamb’s singular solutions, i.e., the integralsolutions for two concentrated surface loads in two directions; and their derivatives are used to represent the scattered wave fields. A technique is proposed to calculate the integrals in the wave-number domain based on the method of steepest descent. For the interior region, the wave fields for the fluid layer and soft soil deposit are expressed in terms of wave functions which satisfy the equation of motion. The continuity condition at the interface of the media is satisfied in the least square sense. The effects of geometric topography, soil amplification and fluid layer subject to different types of incident harmonic plane waves are analyzed and discussed..  相似文献   

莺歌海盆地DF1-1-11井有孔虫生物地层与沉积环境研究   总被引：1，自引：0，他引：1  

何卫军  谢金有  刘新宇  李珊珊 《地层学杂志》2011,(1):81-87

结合ODP184航次及2008年"国际地层表"等研究成果,对莺歌海盆地基准井DF1-1-11井岩屑地层(630～3508 m)的有孔虫定量分析资料进行研究,建立可靠的生物地层及年代地层格架,并通过对钻井中有孔虫丰度、分异度、浮游比例、组合特征及古水深估算分析,讨论了DF1-1一11井中中新世以来的沉积环境演化.研究结果...  相似文献   

班公湖-怒江缝合带西段改则硅质岩地球化学征及沉积环境   总被引：5，自引：0，他引：5  

冯彩霞 《矿床地质》2011,30(5):773-786

班公湖-怒江缝合带是西藏第二条规模巨大的基性-超基性岩带.文章通过对该带西段改则地区硅质岩的系统地球化学研究,探讨了硅质岩形成的成因和构造背景.研究表明:①硅质岩的w(SiO2)变化范围在85.23％～93.73％之间,Si/Al比值为34.08～56.92,表明它们含有较高比例的陆源泥质沉积物;②Hf、Pb、Nb、T...  相似文献