桂西北天峨地区下石炭统有孔虫带及地层划分

桂西北天峨地区孤立碳酸盐台地 ,上泥盆统顶部至上石炭统下部有孔虫十分发育 ,可划分 15个有孔虫生物组合带 ,它们是地层划分对比的重要依据。以有孔虫Eoendothyra与Quasiendothyra的灭绝、Bisphaera的大量出现划分泥盆系 /石炭系 ,以Eoparastaffella的出现作为维宪阶的底界 ,以Globivalvulina或Pseudostaffella的出现作为上、下石炭统的划分标志 ,生物分带明显 ,与岩石地层分界吻合或基本一致 ,是较理想的地层分界     

莱阳凹陷页岩气资源潜力前景分析

山东省白垩世地层以胶莱坳陷最具代表性,白垩系中页岩气赋存地层为莱阳群。一直认为莱阳凹陷是胶莱坳陷寻找石油和页岩气的有利区域,胜利油田从20世纪五六十年代开始做了大量工作,均未取得突破性成果。莱阳凹陷内较好的暗色泥页岩(烃源岩),大部出露或被剥蚀,通过近几年的调查研究认为莱阳凹陷具有页岩气形成的条件,在研究莱阳凹陷的地质特征、有机地化特征、恢复原型盆地等基础上,圈定了页岩气成藏远景区。     

准噶尔盆地滴南凸起侵入岩发育特征及储层主控因素——以滴西185井区下石炭统松喀尔苏组为例

准噶尔盆地滴南凸起具有较好的油气显示和油气勘探潜力。以滴西185井区下石炭统松喀尔苏组侵入岩为研究对象,采用岩心观察、镜下鉴定和常规物性分析,结合钻、测井和地震资料,分析侵入岩岩性、分布特征及储层主控因素。结果表明：研究区下石炭统松喀尔苏组侵入岩主要为花岗斑岩与闪长玢岩,闪长玢岩分布于滴西181井南断裂上盘,厚度随侵入距离的增大而减小,花岗斑岩分布不受滴西181井南断裂控制;花岗斑岩储集空间以次生溶蚀孔和微裂缝为主,闪长玢岩储集空间主要为次生溶蚀微孔。闪长玢岩和花岗斑岩侵入体有利储层的发育受侵入相、矿物组分、溶蚀作用、侵入时间和岩浆性质等因素控制,油气往往趋向在侵入体上部边缘亚相带或与围岩接触带相带附近富集成藏。花岗斑岩暗色矿物质量分数明显较闪长玢岩的少,造缝能力强,长石斑晶和基质质量分数明显较闪长玢岩的高,次生溶蚀孔隙面孔率占比大,各类次生孔隙组合与构造微裂缝沟通并成为有利储层。后期岩浆侵入使气水溶液和热液等流体沿早期原生孔隙和次生孔缝渗透,发生溶蚀和热液充填等作用,溶蚀作用可提高侵入岩储层的孔隙度和渗透率,改善早期侵入岩储层的品质;热液充填作用在一定程度上减少原生孔隙度,降低早期侵...     

云南个旧卡房地区成矿规律及资源潜力预测

文章在前人资料基础上对卡房地区的地质特征进行了概述,总结了该地区的成矿规律,并论述了具有找矿潜力的区城及其依据,为扩大资源量、开展下一轮找矿提供参考.     

非洲油气资源潜力及投资环境分析

非洲拥有丰富的石油资源,已探明石油储量仅次于中东和美洲地区。由于中东局势动荡不定,国际市场原油价格居高不下,石油开发商们更加重视蕴藏着巨大开采潜力的非洲石油,非洲已成为世界油气勘探的热点地区之一。     

湖南永顺区块牛蹄塘组页岩气勘探前景及选区评价

永顺区块位于中上扬子地台牛蹄塘组页岩气富集区,整体勘探程度较低,页岩气勘探前景不明。利用露头、岩心、测试和地震等资料,分析研究区牛蹄塘组页岩气勘探前景,以页岩气富集理论为指导,结合地球化学分析技术、地质评价—地球物理联合预测技术,评价有利勘探区块。结果表明:永顺区块牛蹄塘组具有优越的烃源供给条件,厚度大,分布广,燕山期是其主要的聚集及成藏期;页岩储层低孔低渗特征明显,储集类型多样,脆性矿物丰富,有利于页岩气储集及压裂改造;研究区构造样式相对简单,断裂、盖层发育分区性明显,关键构造事件控制源盖动态匹配。残留向斜斜坡是研究区有利的勘探目标,Ⅰ类有利区面积为102.1km~2,Ⅱ类有利区面积为88.2km~2。     

渤中21构造区湖底扇成因模式及勘探意义

为落实渤中21构造东二下段岩性圈闭类型及规模、储量规模,在对渤中21构造区古地貌背景和沉积体系演化模式的耦合分析基础上,通过井震标定、精细地震追踪、宏观地震相组合及多属性分析,与渤海已钻探典型湖底扇特征进行对比。结果表明:气层段为湖底扇型岩性圈闭。渤海湖底扇从成因机制上分为与早期继承性发育坡折带,以及与大型三角洲建造形成的同沉积坡折带密切相关的2种类型。渤中21构造区湖底扇成因与大型三角洲建造形成的同沉积坡折带相关。在成因模式指导下,通过对湖底扇沉积厚度、地震微相特征分析,用地震岩相正演模拟方法对湖底扇富砂区范围进行圈定,落实湖底扇岩性圈闭边界,为渤中21构造区储量计算和勘探评价提供依据,为开展隐蔽油气藏勘探提供有利目标。     

对山西省耕地后备资源潜力的分析及研究

本文通过对山西省耕地后备资源潜力的分析及研究,可以看出本省的耕地后备资源潜力分布和构成特点为可开垦后备资源,主要集中在其他草地、裸地和内陆滩涂三个地类,而可开垦为耕地后备资源的地域分布主要集中在忻州市、晋中市、大同市、吕梁市和临汾市这五个地市。根据本文结论,本轮耕地后备资源调查评价工作可以将工作重点转移到其他草地、裸地和内陆滩涂三个地类的评价指标的调查和获取上,为山西省各县（区、市）的新一轮耕地后备资源调查评价工作的开展提供借鉴。     

国内外页岩气研究进展及山东省页岩气资源潜力

当前国际能源供需矛盾突出,能源问题日益成为各国关注的焦点,页岩气资源勘查开发备受世界瞩目;全球页岩气资源非常丰富,主要分布在北美、中亚和中国、拉美、中东和北非、前苏联地区;近年来随着开采和利用技术的不断进步,美洲、欧洲、亚洲国家对页岩气的勘查开发正在形成热潮。中国页岩气资源丰富,对页岩气的区域勘查研究越来越多,取得了不错的成果,但总体上中国页岩气的研究和勘查尚处于起步阶段,同时中国的开发技术与国外相比还存在较大的差距。结合山东省不同类型富含有机质泥页岩的具体特点和国内外页岩气勘查经验,初步认为山东省具有一定的页岩气形成条件,山东省页岩气远景区地层主要为新生代古近纪济阳群和五图群及官庄群,中生代早白垩世莱阳群,古生代石炭—二叠纪月门沟群和石盒子群;在综合考虑页岩的赋存层位、页岩成气潜力和页岩气开发可行性的基础上,提出了山东省页岩气潜力区为:济阳坳陷区、临清坳陷区、胶莱坳陷区和黄县(龙口)凹陷以及鲁西南潜隆起区,其中济阳-临清坳陷地区页岩气潜力较好。     

中国钼金属矿床特征及资源潜力分析

钼是重要的战略性矿产资源。我国的钼矿床类型多样,主要分为内生和外生等5种类型,其中斑岩型矿床是最重要的矿床类型。钼矿床分布具有区域分带的特点,这种特点与其成矿动力学背景密切相关。在今后钼矿床的勘查找矿工作中,把加强已有矿山的深部和外围找矿与开展非传统地区的勘查找矿相结合,重视内生矿床尤其是斑岩型矿床的成矿潜力,以实现钼矿床的找矿新突破。     

松辽盆地西缘高力板断陷油气勘探层系及资源前景

以探查松辽盆地西缘高力板断陷油气资源前景为目的实施的高D1井,在巨厚层中生代火山岩之下钻遇中侏罗统万宝组、上二叠统林西组两套油气勘探层系。根据高D1井资料,探讨研究区地层充填序列及沉积特征,分析高D1井暗色泥岩有机地球化学特征。结果表明:万宝组沉积环境为扇三角洲前缘沉积亚相,林西组沉积环境为滨浅湖和半深湖沉积亚相。万宝组烃源岩有机质丰度高、有机质类型为Ⅱ1型,整体处于低熟—成熟阶段,具备较好的生烃物质基础;林西组烃源岩有机质丰度中等,有机质类型以Ⅱ1型为主,整体处于成熟阶段,具有良好的生气前景。中侏罗统万宝组和上二叠统林西组生储盖组合完整,可以作为松辽盆地西缘油气勘探的新层系。     

川东地区下三叠统嘉陵江组天然气特征及气源分析

川东地区下三叠统嘉陵江组气源不明确.测试川东地区48口井天然气地球化学参数,分析嘉陵江组天然气特征、成因及气源.结果表明:川东地区下三叠统嘉陵江组天然气具有甲烷体积分数高、乙烷体积分数次之、丙烷—重烃体积分数低的特征,为典型的高成熟度干气气藏,主要为原油二次裂解热成因油型气;嘉陵江组天然气主要来源于上二叠统龙潭组泥岩和...     

湘中涟源凹陷下石炭统天鹅坪组页岩气成藏条件及主控因素

下石炭统天鹅坪组页岩是湘中地区页岩气勘探的新层系。基于野外地质调查、页岩气钻井的样品采集和分析测试等对湘中涟源凹陷石炭系天鹅坪组泥页岩的发育特征、有机地球化学特征、储层特征和含气性等页岩气成藏地质条件进行了分析。结果表明:涟源凹陷石炭系天鹅坪组有机质丰度较高,w（TOC）分布在0.78%~2.84%之间,有机质类型以Ⅱ₁型为主,有机质成熟度R_o分布在1.48%~2.09%之间,处于高成熟演化阶段;泥页岩矿物成分以石英和黏土矿物为主,黏土矿物主要由伊蒙混层、伊利石和绿泥石组成;泥页岩有机质孔较发育,孔隙度平均为1.97%,渗透率平均为0.847×10-3 μm2,但大多小于0.1×10-3 μm2;湘新地4井天鹅坪组泥页岩含气量分布在1.64~4.29 m3/t,平均2.69 m3/t（不含残余气）。结合区域构造-沉积演化背景的分析表明,涟源凹陷下石炭统天鹅坪组页岩气成藏条件的主控因素为沉积环境、构造保存条件,其中深水陆棚相是页岩气有利相带,复杂构造背景下由对冲式构造样式形成的向斜对页岩气保存条件最为有利,是研究区页岩气勘探的"甜点区"。研究成果可以为该区后续油气勘探提供参考。      

Application of Dempster-Shafer theory in mineral resource potential mapping

The Dempster-Shafer theory has been successfully applied to mineral resource potential mapping in GIS environmental. In this applied form, basic probability assignment and combined basic probability assignment are applied to measuring map pattern and map pattern combination, respectively; and the environment composed of the only two singleton sets (deposit set and non-deposit set), is used for expressing the entire map area. For a subarea in which the certain map pattern combination exists, the combined basic probability assignment corresponding to the map pattern combination existing in this subarea, expresses the belief of inferring the subarea belonging to the deposit set from the evidence that the corresponding map pattern combination existing in the subarea. Thus, it may be served as a statistical index measuring the relative mineral resource potentials of the subarea. And it may be determined like 1) dividing the map area into a series of small equal-sized grid cells and then select the training sample set composed of the well-known grid cells or the entire grid cells; 2) estimating the basic probability assignments corresponding to each map pattern fromthe training sample set; 3) determining the map pattern combination existing in each cell, and then appling the Dempster's Rule of Combination to integrating the all basic probability assignments corresponding to the map patterns existing in the cell into the combined basic probability assignment. Mineral resource potential mapping with the Dempster-Shafer theory is demonstrated on a case study to select mineral resource targets. The experimental results manifest that the model can be compared with the weights of evidence model in the effectiveness of mineral resource target selection.     

Application of Dempster-Shafer theory in mineral resource potential mapping

The Dempster-Shafer theory has been successfully applied to mineral resource potential mapping in G1S environmental. In this applied form, basic probability assignment and combined basic probability assignment are applied to measuring map pattern and map pattern combination, respectively; and the environment composed of the only two singleton sets (deposit set and non-deposit set), is used for expressing the entire map area. For a subarea in which the certain map pattern combination exists, the combined basic probability assignment corresponding to the map pattern combination existing in this subarea, expresses the belief of inferring the subarea belonging to the deposit set from the evidence that the corresponding map pattern combination existing in the subarea. Thus, it may be served as a statistical index measuring the relative mineral resource potentials of the subarea. And it may be determined like 1) dividing the map area into a series of small equal-sized grid cells and then select the training sample set composed of the well-known grid cells or the entire grid cells; 2) estimating the basic probability assignments corresponding to each map pattern from the training sample set; 3) determining the map pattern combination existing in each cell, and then appling the Dempster's Rule of Combination to integrating the all basic probability assignments corresponding to the map patterns existing in the cell into the combined basic probability assignment. Mineral resource potential mapping with the Dempster-Shafer theory is demonstrated on a case study to select mineral resource targets. The experimental results manifest that the model can be compared with the weights of evidence model in the effectiveness of mineral resource target selection.     

Application of Dempster-Shafer theory in mineral resource potential mapping

The Dempster-Shafer theory has been successfully applied to mineral resource potential mapping in GIS environmental. In this applied form, basic probability assignment and combined basic probability assignment are applied to measuring map pattem and map pattem combination, respectively; and the environment composed of the only two singleton sets （deposit set and non-deposit set）, is used for expressing the entire map area. For a subarea in which the certain map pattern combination exists, the combined basic probability assignment corresponding to the map pattern combination existing in this subarea, expresses the belief of inferring the subarea belonging to the deposit set from the evidence that the corresponding map pattern combination existing in the subarea. Thus, it may be served as a statistical index measuring the relative mineral resource potentials of the subarea. And it may be determined like 1） dividing the map area into a series of small equal-sized grid cells and then select the training sample set composed of the well-known grid cells or the entire grid cells; 2） estimating the basic probability assignments corresponding to each map pattern fromthe training sample set; 3） determining the map pattern combination existing in each cell, and then appling the Dempster＇s Rule of Combination to integrating the all basic probability assignments corresponding to the map patterns existing in the cell into the combined basic probability assignment. Mineral resource potential mapping with the Dempster-Shafer theory is demonstrated on a case study to select mineral resource targets. The experimental results manifest that the model can be compared with the weights of evidence model in the effectiveness of mineral resource target selection.     

塔中区块高温高压裂缝性气藏封堵层气蚀剪切失效机理

为了深入了解塔中区块高温高压裂缝性气藏封堵层失效问题, 基于储层特征和流体特性的深入分析, 结合封堵层微尺度物理结构特征, 对高温高压裂缝性气藏封堵层失效特征进行了研究, 提出了封堵层气蚀剪切失效概念, 构建了封堵层气蚀剪切失效的物理模型, 并借助颗粒物质力学和液桥理论, 对封堵层气蚀剪切失效过程进行了深入研究, 并基于反向气蚀原理, 开展了室内反向承压实验研究。研究结果表明, 裂缝性封堵层"气蚀剪切"失效作为一种气藏封堵层特有的失效模式, 其发生过程分为3个阶段: 气体扩散降黏破坏、气蚀剪切剥离破坏和气液置换错位剪切破坏; 正向承压6 MPa的统一封堵层, 对于不同属性的流体其抗剪切破坏能力不同, 当反向驱替流体由柴油转变为氮气时, 封堵层的反向承压值由原来的2.0 MPa(22 min)和2.5 MPa(30 min)分别减小到后来的1.5 MPa(10 min)和1.0 MPa(12 min), 综合抗剪切性能降低了约50%, 表明气体具有与液体不同的破坏能力和机制。      

黔北煤田JP区块煤层气储层物化特征及含气量影响因素

利用钻孔岩心观察、煤体结构频度统计及取心化验数据统计等资料,研究黔北煤田JP区块上二叠统煤层气的综合地质条件、含气规律及机制。结果表明:JP区块中、下煤组煤岩结构完整性优于上煤组的,东南翼优于西北翼的,煤层及围岩组合形式、构造应力释放方式决定煤储层结构完整性。煤层有机组分平均为79.29%,煤层镜质体最大反射率平均为3.08%,进入热裂解阶段晚期。煤层气组分以甲烷为主,储层平均含气量为12.17m3/t。煤层含气量受多种因素影响,其中与煤层埋深、热演化程度、高位热量等呈正相关关系,与煤层挥发分产率、地层倾角等呈负相关关系。三大主要控气要素——煤层埋深、地质构造稳定性和热演化程度决定煤层气的分布特征,相对宽缓的向斜西北翼为有利含气区。该结果为黔北地区的煤层气勘探提供指导。     

Estimation of potential distribution of gas hydrate in the northern South China Sea

Gas hydrate research has significant importance for securing world energy resources, and has the potential to produce considerable economic benefits. Previous studies have shown that the South China Sea is an area that harbors gas hydrates. However, there is a lack of systematic investigations and understanding on the distribution of gas hydrate throughout the region. In this paper, we applied mineral resource quantitative assessment techniques to forecast and estimate the potential distribution of gas hydrate resources in the northern South China Sea. However, current hydrate samples from the South China Sea are too few to produce models of occurrences. Thus, according to similarity and contrast principles of mineral outputs, we can use a similar hydrate-mining environment with sufficient gas hydrate data as a testing ground for modeling northern South China Sea gas hydrate conditions. We selected the Gulf of Mexico, which has extensively studied gas hydrates, to develop predictive models of gas hydrate distributions, and to test errors in the model. Then, we compared the existing northern South China Sea hydrate-mining data with the Gulf of Mexico characteristics, and collated the relevant data into the model. Subsequently, we applied the model to the northern South China Sea to obtain the potential gas hydrate distribution of the area, and to identify significant exploration targets. Finally, we evaluated the reliability of the predicted results. The south seabed area of Taiwan Bank is recommended as a priority exploration target. The Zhujiang Mouth, Southeast Hainan, and Southwest Taiwan Basins, including the South Bijia Basin, also are recommended as exploration target areas. In addition, the method in this paper can provide a useful predictive approach for gas hydrate resource assessment, which gives a scientific basis for construction and implementation of long-term planning for gas hydrate exploration and general exploitation of the seabed of China.