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本文主要应用岩石学理论,对雪１井三叠系雷口坡组、嘉陵江储集层段的沉积、成岩作用进行综合研究。探讨了雪１井三叠系雷口坡组、嘉陵江组储集层段的沉积模式,划出了有利的沉积相带（滩亚相）。认为三叠系雷口坡组、嘉陵江组储层气藏的形成主要受控于沉积和成岩作用,储层主要发育于滩亚相发育部位,滩亚相沉积物必须配之与有利的成岩作用演化序列,才有可能发育成有利储层。 相似文献
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塔里木盆地三叠纪进入前陆盆地发展阶段,该地区油气资源丰富,但整体勘探和研究程度低,对该地区三叠系进行研究具有重要的理论意义和实际意义。利用S8井岩芯资料、岩芯样品50余块、岩石薄片100张、30余口钻井、测井资料,并结合二维44条地震测线、三维地震(1 300 km~2)资料解释,对塔里木盆地顺北地区三叠系沉积相特征进行研究,根据该研究区沉积特点,将其分为三角洲和湖泊沉积相,进一步识别出水下分流河道、分流间湾、浅湖砂坝和浅湖泥四种微相。三角洲水下分流河道方向为由北向南,受北部沙雅隆起隆升强弱的影响,水下分流河道发育规模具有弱(柯吐尔组)—强(阿克库勒组)—弱(哈拉哈塘组)的演化特征。以上述沉积演化特征为基础,建立了顺北地区三角洲-湖泊的沉积模式。 相似文献
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塔里木盆地轮南2井油藏的注入史研究——来自流体包裹体的证据 总被引：10，自引：0，他引：10
轮南２井为轮南潜山构造２号高点上的一口高产油气井,主要产层为三叠系,其次为侏罗系。通过对轮南２井油藏中流体包体分布特征和成分研究,结合轮南地区构造演化史,埋藏 生烃史分析,明确了塔里木盆地轮南２井三叠系油藏主要为一次油气大规模注入形成,油气注入时间主要在１４～１６Ｍａ左右,油源来自于中旬奥陶纪烃源岩,件罗系油藏则具有两次的油气注入,第一次的油气流入主要发生在１４～１６Ｍａ左右,油源来自于中晚陶统烃 相似文献
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四川盆地西南缘的沐川生基坪剖面(PTB)是研究海陆交互相二叠系-三叠系界线的关键。本次研究对研究区P-T界线地层的岩石学与地球化学特征进行研究,探讨了研究区的岩石组合特征、沉积环境、风化作用、古气候及物源特征。还原环境的宣威组中叶肢介化石、煤线和水平层理的出现,反映了近缘的滨浅湖相沉积特征;氧化环境的飞仙关组中双向交错层理、透镜状层理和脉状层理、波痕印模和干裂构造等特征的出现,反映了浅海相沉积特征。通过研究四川盆地晚二叠世-早三叠世岩相古地理可知,研究区宣威组的浅湖相和飞仙关组的潮间-潮下相沉积环境与前人所得出的海陆交互相和滨浅海相沉积环境基本吻合,反映了海水的持续入侵,与晚二叠世-早三叠世的海平面升降事件一致,表现了峨眉山玄武岩喷发之后伴随的海侵。高CIA、CIW和PIA值和A-CN-K和A-C-N图解共同指示了沉积岩物源区经历了强烈的风化作用,并暗示宣威组与飞仙关组沉积时期可能处于温暖潮湿的沉积气候环境。根据研究区宣威组、飞仙关组岩石组合中的玄武岩碎屑特征,并结合稀土元素特征、La/Yb-ΣREE、Co/Th-La/Sc源岩判别关系可推测沐川生基坪二叠系-三叠系界线处沉积岩的物质来源主要可能为宣威组底部的峨眉山玄武岩。 相似文献
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四道沟低产油气藏是目前在哈密坳陷内钻探众多构造圈闭后所发现的唯一油气藏，通过对油藏构造、储层特征和油气成藏分析表明，四道沟构造存在二期油气运移与聚集，第一期形成类似哈2井三叠系和侏罗系砂岩储层中的沥青，它来自三堡凹陷源岩生成的油气；第二期为四道沟构造上哈2、哈3井储层近源捕获的油气。三堡凹陷源岩在中侏罗统西山窑组沉积以后曾有较大规模的测量 气生成与运移，油气运移路线主要是向东或东北方向。储层物性差、裂缝不发育，早期油藏被破坏，后期油气源供给不足是四道沟构造上哈2、哈3井油气低产的主要原因，该地区下一步油气勘探应围绕三堡生油凹陷，以寻找未遭破坏的早期油气藏为勘探方向，以三叠系与侏罗系不整合附近的构造圈闭、地层圈闭、岩性罪状闭和三叠纪古构造圈闭及裂缝发育带为主要勘探目标。 相似文献
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地-井瞬变电磁井旁板状导体异常响应特征分析 总被引：1，自引：0，他引：1
在实际工作中,地-井瞬变电磁井旁盲矿的异常响应受多种因素影响,曲线特征复杂。为了研究井旁板状导体位置、埋深、产状等参数对地-井瞬变电磁异常响应的影响,这里通过数值模拟计算了四类39个理论模型,分析了板状导体倾角、埋深变化及其与钻孔距离、相对位置变化的异常响应,总结了响应特征与板体几何参数之间的内在联系规律,为定性或半定量解释井旁盲矿异常提供了依据。 相似文献
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1 桑东三叠系储层特征 桑东地区三叠系是一套碎悄岩地层，其储层主要集中在三套大的砂体中，分别是三叠系中统阿克库勒组第一段（下油组）、第三组（中油组）和上三叠统哈拉哈塘组第一段（上油组），三叠系上油组为辫状三角洲平原分流河道沉积，岩性为浅灰色细中粒砂岩， 相似文献
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以层序地层学和沉积学理论为指导，依托大陆架科学钻探CSDP-2井并结合WX5-ST1井、N5井及南京江宁地区典型剖面，利用岩性、测井、古生物等资料，在识别苏北-南黄海盆地各级层序界面的基础上，将研究区上二叠统-下三叠统划分为2个长期基准面旋回（LC1、LC2）和3个中期基准面旋回（MC1-MC3）。研究表明，南黄海盆地与苏北盆地实为被海岸线分割的同一沉积盆地，其上二叠统-下三叠统具有良好的可对比性，其中：LC1长期基准面旋回（上二叠统）不对称性明显，最大海泛面MFS1对应于龙潭组中下部浅海陆棚相的泥岩，LC2长期基准面旋回（下三叠统）因后期印支运动抬升剥蚀，仅存基准面上升半旋回；研究区MC1旋回期（龙潭组）主要发育潮坪、泻湖、三角洲等海陆过渡相，各地水深相差不大；MC2、MC3时期（大隆组、青龙组）发育浅海陆棚、潮坪、泻湖及碳酸盐岩台地等沉积相，水体演变为南西深而北东浅，分析认为是东吴运动时期盆地差异抬升的结果。 相似文献
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The Helanshan tectonic belt is located to the west of the Ordos Basin, and separates the Alxa (or Yinshan) Massif to the west from the Ordos block to the east. Triassic sedimentation in the Helanshan tectonic belt records important information about tectono-sedimentary process between the Alxa Massif and the Ordos block. Detailed geological mapping and investigation on the lithological package, sedimentary facies and paleocurrent orientation have been conducted on the Middle to Upper Triassic clastic rocks in the Helanshan tectonic belt. The succession is characterized by upward-fining sequence and comprises coarse grained alluvial-fluvial facies in the lower part as well as deltaic-lacustrine facies in the upper part. Based on detailed study and comparisons on the sedimentary sequence along various sections, the Middle to Upper Triassic strata have been revealed that show clear southeastward-deepening sedimentary differentiation and transgression from southwest to northeast, which are consistent with the southeastward flowing paleocurrent. These features indicate a southeastward-dipping paleogeography in the Helanshan tectonic belt, which was original western part of southeastward orientated fluvial-lacustrine system in the northwestern proto-Ordos Basin. Further to the east, the Triassic succession in the Ordos Basin displays gradually thickening and alluvial-fluvial system flowed from southeast to northwest, showing a huge thick sedimentary wedge in the western basin margin. Together with the Late Permian–Early Triassic closure of the Paleo-Asian Ocean to the north, the Late Triassic extensional structures and diabase dykes in the Helanshan tectonic belt, all the above sedimentary features could be mostly interpreted as records of an extensional basin correlated to post-collisional collapse of the Central Asian Orogenic Belt. 相似文献
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在工区面积大、钻井少的情况下开展地震相研究,可以有效绘出沉积相展布图。对四川盆地中部雷口坡组四3亚段利用GS1和YS104两口井进行地震地质标定,建立了膏盐湖、白云岩坪及颗粒滩等几种不同沉积微相的地震响应模式。膏盐湖相表现为强振幅、高连续的地震响应,而颗粒滩及白云岩坪主要表现为中振幅、低连续的地震响应特征。在地质标定基础上,对全区利用波形分类技术开展地震相研究,恢复了古沉积环境,获得了颗粒滩相及白云岩坪的展布图,这些分布区是有利储层的发育区。龙岗—营山—南充—蓬溪一带处于颗粒滩、白云岩坪有利相带,且处于雷四3亚段地层剥蚀线附近,受岩溶改造强烈,储层较为发育,是川中地区的重要勘探对象。 相似文献
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分析了华北克拉通新太古代—三叠纪 16个碎屑沉积岩组合样品。与Taylor和McLennan等提出的太古宙—元古宙界线前后沉积岩及上地壳化学组成变化不同 ,新太古代五台群沉积岩具明显负Eu异常 ,相容元素含量很低 ,不相容元素含量较高 ,与典型后太古宙沉积物组成类似。而古元古代沉积岩比五台群显示出异常高的Eu/Eu 值 ,w(Sc) /w(Th) ,w(Cr) /w (Th)比值。青白口纪、寒武纪、石炭纪和二叠纪沉积岩显示正常的后太古宙沉积岩特征。三叠纪沉积岩的Eu/Eu 值 ,w (Sc) /w (Th) ,w(Cr) /w(Th)比值再次显著升高 ,推测与华北和扬子克拉通最终的陆陆碰撞作用有关。因此 ,太古宙—元古宙界线并不一致对应于上地壳演化程度迅速增高。大陆上地壳并非总是向着分异程度提高的方向演化 ,而是部分时期可出现演化程度降低的异常现象。 相似文献
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《Gondwana Research》2014,26(4):1680-1689
In southern Tibet, Late Triassic sequences are especially important to understanding the assembly of the Lhasa terrane prior to Indo-Asian collision. We report new data relevant to the provenance of a Late Triassic clastic sequence from the Mailonggang Formation in the central Lhasa terrane, Tibet. Petrographic studies and detrital heavy mineral assemblages indicate a proximal orogenic provenance, including volcanic, sedimentary and some ultramafic and metamorphic rocks. In situ detrital zircon Hf and U–Pb isotope data are consistent with derivation of these rocks from nearby Triassic magmatic rocks and basement that comprise part of the newly recognized Late Permian–Triassic Sumdo–Cuoqen orogenic belt. The new data suggests correlation with the Upper Triassic Langjiexue Group which lies on the opposing (southern) side of Indus–Yarlung ophiolite. Sediments from both the Mailonggang Formation and Langjiexue Group are interpreted to represent formerly contiguous parts of a sequence deposited on the southern flanks of the Sumdo–Cuoqen belt. 相似文献
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下扬子地区中生代发生了多期挤压-伸展构造作用,是制约该区域油气勘探取得突破的重要因素之一。为揭示下扬子区中生代构造作用对油气保存的影响,文章通过地震剖面解释资料、野外露头调查、区域构造演化历史分析,并结合皖泾地1井获取的岩芯资料和油气显示情况综合探讨了下扬子南部地区的有利构造保存条件。地震解释剖面和地表调查结果表明下扬子南部地区晚三叠世以来主要经历了两期重要的构造作用:第一期为印支期挤压作用造成褶皱变形和逆冲断层以及隆升剥蚀;第二期为晚白垩世以来的伸展作用,形成断陷盆地和正断层活动。皖泾地1井在二叠系页岩地层中获得页岩气显示,在下三叠统殷坑组灰岩中钻遇轻质油,表明下扬子南部区域具有良好的油气富集条件和资源潜力。构造保存条件分析表明皖泾地1井位于褶皱冲断带内的向斜部位,印支期隆升剥蚀量小,晚白垩世以来伸展拉张幅度小,具有良好的封闭性和成藏条件,是有利的构造保存部位。 相似文献
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南黄海盆地中部隆起上古生界沉积环境探讨 总被引：1，自引：0，他引：1
CSDP-2井是大陆架科学钻探计划（CSDP）在南黄海盆地中部隆起实施的第一口连续取芯井,完井深度2 843.18 m,平均取芯率高达97.7%。综合利用该井岩芯、测井、岩石薄片及古生物化石资料,准确识别出南黄海盆地中部隆起上古生界的岩石类型、沉积构造、岩性组合序列等特征,进而探讨研究区沉积环境及其垂向演化规律。研究结果显示:CSDP-2井所钻遇的二叠系、石炭系、泥盆系地层既包含碎屑岩也包含碳酸盐岩,发育了三角洲相、滨岸相、潮坪相、碳酸盐岩台地相、浅海陆棚相等多种沉积相类型;南黄海盆地晚古生代先后经历了两个完整的海侵-海退旋回,自下而上发育碎屑岩浅海-潮坪沉积体系、碳酸盐岩潮坪-潟湖-颗粒滩沉积体系和碎屑岩三角洲沉积体系,反映了研究区由海相向海陆过渡相逐渐演化的沉积充填过程。 相似文献
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The hydrocarbon potential of the sub-surface Tertiary sedimentary rock sequences of the Lokichar basin system (NW-Kenya) has been interpreted using some selective geochemical analysis of rock samples in Loperot-1 Well (denoted as LT-1 Well) for their total organic carbon (TOC) which forms the premise of this study. Understanding the sub-surface structures and depositional environments conducive for hydrocarbon generation and trapping is essential as it forms the basis for exploration. The organic matter richness and degree of thermal alteration and/or maturation are factors useful in evaluating the potential source rocks. Rock-Eval pyrolysis has been employed on selected rock samples with high TOC for quantification of data and this would help in precise identification of phases of hydrocarbon generation. 相似文献
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The hydrocarbon potential of the sub-surface Lamu basin (SE Kenya) offshore sedimentary rock sequences of Mesozoic age formed the premise of this study. Major similarities and some differences in structural styles can be seen between the offshore Lamu and the Gondwana basins along the margins of Indian Ocean and Carnarvon basin along Australia’s North West Shelf, where oil pools have been discovered. The existing well results and recent 2-D seismic data have been interpreted to identify various structural styles and play fairway segments, which bolster the possibility that the Karroo to late Tertiary sedimentary mega-sequences (～3000–13000 m thick), suitable for hydrocarbon exploration, could be visualized in both the onshore and offshore Lamu basin areas. Similarly, major reservoir-seal and potential source intervals have been identified in the present study. The hydrocarbon indicator from the well-log data shows that oil potential in complex multiple petroleum systems, ranging in age from Triassic to Tertiary, have tested gas deposits. Well control of only one exploratory well per 25,000 sq km in the offshore Lamu basin shows evidence of the existence of at least two active petroleum systems. The Lamu basin has evolved consequent to a complex tectonic activity related to continental rifting and block faulting of the Lamu-Anza and Central African rift systems. An attempt has been made to recommend the probable prognostic structural leads, which are controlled by NW-SE trending faults sympathetic to the Anza-Lamu rift systems, for future essential sub-surface features of source rocks, reservoir rocks and the cap rocks in the Lamu basin. 相似文献
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A 400-meter-thick volcanic and fine-grained clastic sedimentary succession in Quebrada Doña Ines Chica (26°07′S latitude; 69°20'W longitude) provides a record of Late Triassic deposition in the Atacama region of northern Chile. The strata are conformably overlain by fossiliferous marine limestones and sandstones of Late Triassic to Early Jurassic (Sinemurian) age which contain the oldest ichthyosaur remains known from Central and South America. The clastic succession is interpreted as coastal fluvial deposits, with the overlying limestones representing shelf deposits. 相似文献