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1.
在当前国内油气供需紧张的严峻形势下,开展"第二深度空间"的油气勘探"势在必行",也是"当务之急"."第二深度空间"的油气勘探需解决3个问题.一是油气无机成因的地球化学证据.原油、沥青、干酪根的Pb,Sr,Nd同位素示踪、原油中异常高含量的金属微量元素、原油中有机硅化合物的发现等均表明原油可以由无机反应而生成.二是油气无机成因论是可以指导油气勘探的.油气的分布与中地壳的低速、高导层的耦合表明有成因关系,中地壳的低速、高导层是油气的发生器,也是初始储层,据此可以对油气田进行预测.柴达木盆地昆北花岗岩油田的发现是一典型案例.三是"第二深度空间"的油气勘探需要地球物理方法和技术的支撑.目前第4代采集处理新理论、新方法业已提出.地球物理学家已经把深部勘探的新方法、新技术提到议事日程.总之,"第二深度空间"的油气勘探是有理论依据的,是可能的,是可操作的.发现大型、超大型油气田指日可待. 相似文献
2.
滩坝砂体是岩性油气藏勘探的重要储集体,已经成为中国陆相湖盆增储上产的重要现实领域。为了深入评价柴达木盆地西部扎哈泉地区新近系中新统上干柴沟组滨浅湖滩坝砂体的油气勘探前景以及预测有利勘探区带和勘探目标,文中在岩心观察和钻(测)井资料综合分析的基础上,结合岩石薄片、累计粒度概率曲线、暗色泥岩泥地比和砂地比敏感参数分析结果,对该地区上干柴沟组滨浅湖滩坝砂体发育演化特征和古地貌演化特征进行了详细研究。结果表明: (1)扎哈泉地区上干柴沟组沉积时期发育辫状三角洲—滨浅湖沉积体系,滩坝砂体发育,岩性主要为岩屑长石细砂岩—极细砂岩,成分成熟度中等—较差、分选磨圆度中等—好,粒度概率曲线以反映波浪作用的两段跳跃式加悬浮式为主;沉积构造类型多样,主要发育浪成沙纹交错层理、波状层理、丘状交错层理和透镜状层理。(2)上干柴沟组沉积时期,研究区滩坝砂体发育规模先增大后减小;早期到中期,滩坝砂体发育规模不断增大,其中近岸坝主要表现为向南和向东2个方向扩张,呈北偏西方向展布,远岸坝主要表现为南北方向扩张,呈近北西—南东方向展布;中期到晚期,滩坝砂体的发育规模不断减小,其中近岸坝主要表现为向南北2个方向收缩并向东扩展,展布方向变为东偏南转东北方向,远岸坝主要表现为南北方向收缩。(3)上干柴沟组沉积时期,研究区古地貌呈西高东低、南北低中间高的特征;从早期到中期,研究区中部古地貌高点不断向东和东南方向大幅度扩展,范围不断扩大;中期到晚期,古地貌高点范围不断向北和北西2个方向收缩,范围缩小;同时,研究区东南角古地貌高点范围不断向北扩大。综合上述分析结果,认为柴达木盆地扎哈泉地区上干柴沟组滩坝砂体发育演化受控于物源规模大小和微古地貌的发育演化,其中微古地貌发育演化是滩坝砂体发育演化的主要控制因素。研究成果可为相似的地质背景下滩坝砂体成因的岩性圈闭预测提供参考。 相似文献
3.
The West Philippine basin (WPB) is a currently inactive marginal basin belonging to Philippine Sea plate, which has a complex formation history and various crust structures. Based on gravity, magnetic and seismic data, the tectonics in West Philippine basin is characterized by amagnma spreading stage and strike slip fractures. NNE trending Okinawa-Luzon fracture zone is a large fracture zone with apparent geomorphology and shows a right-handed movement. The results of joint gravity-magnetic-seismic inversion suggest that the Okinawa-Luzon fracture zone has intensive deformation and is a transform fault. Western existence of the NW trending fractures under Ryukyu Islands Arc is the main cause of the differences between south and north Okinawa Trough. The Urdaneta plateau is not a remained arc, but remnant of mantle plume although its lava chemistry is similar to oceanic island basalt (OIB). 相似文献
4.
近年来,柴达木盆地英西地区渐新统E32获得了持续的重大勘探发现。基于岩心观察、系统的微观岩石学、矿物学以及地球化学分析,系统总结了柴达木盆地英西地区渐新统咸化湖盆中盐类矿物特征、成因及成藏作用：(1)英西地区渐新统E32 4种重要的盐类矿物包括石盐、硬石膏、钙芒硝以及天青石等,或聚集成为具有一定厚度的盐层,或以矿物颗粒形式赋存于基质碳酸盐岩中。上部的盐间油层组的盐层较厚,以石盐为主,下部的盐下油层组的盐层较薄,以石膏为主;(2)盐类矿物“低锰”的元素地球化学特征、与盐类矿物伴生的基质碳酸盐岩具有的“低温成因”的碳氧同位素地球化学特征、未见热液矿物发育的岩石学特征以及分布面积极广的平面展布特征均显示了盐类矿物为典型的咸化湖盆沉积型,而非热液卤水析出型;(3)“盐”在油气成藏过程中发挥着重要作用,包括盐类矿物对裂缝的充填和防止油气逸散的封堵作用、盐层因具有很高的毛管突破压力和塑性特征而具有良好的封盖作用、地层条件下促进白云岩次生孔隙发育的作用以及占据一定的储集空间的消极作用等。这一研究成果可为盐下湖相碳酸盐岩的油气勘探提供重要的指导作用。 相似文献
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利用最新三维地震解释成果,结合钻井和区域地质资料,运用断裂生长指数、平衡地质剖面、趋势厚度恢复等多种方法对马北地区断裂组合、断裂发育期次、断裂演化、构造高点发育及迁移规律进行了精细解剖。依据断层组合关系、安德森断层模式及Harding1974年关于走滑断裂系应力、应变的相关论述,对该地区新生代以来各地质历史时期的应力状态进行了探讨,并以油气动态成藏的方式系统地研究了断裂-构造高点演化与油气藏之间的耦合关系,认为马北地区多期断裂是以马仙断裂为主导的走滑断裂体系,其断裂演化与马仙断裂活动息息相关,且与古今构造之间具有明显的耦合关系,两者共同控制了新生代油气藏的形成、改造及分布。 相似文献
6.
On the basis of the multi-channel seismic data and the other data, using 2DMove software, the tectonic evolution in three seismic profiles was restored since Pliocene. The tectonic restoration results show that: (1) the initial active center lay in the west slope and then was transferred to east and south via trough center during the evolution process; (2) several main normal faults controlled the evolution of the southern Okinawa Trough; (3) since Late Pliocene, the southern Okinawa Trough has experienced two spreading stages. The early is depression in Early-Middle Pleistocene and the late is back-arc spreading in Late Pleistocene and Holocene, which is in primary oceanic crust spreading stage. 相似文献
7.
滩坝砂体是岩性油气藏勘探的重要储集体,已经成为中国陆相湖盆增储上产的重要现实领域。为了深入评价柴达木盆地西部扎哈泉地区新近系中新统上干柴沟组滨浅湖滩坝砂体的油气勘探前景以及预测有利勘探区带和勘探目标,文中在岩心观察和钻(测)井资料综合分析的基础上,结合岩石薄片、累计粒度概率曲线、暗色泥岩泥地比和砂地比敏感参数分析结果,对该地区上干柴沟组滨浅湖滩坝砂体发育演化特征和古地貌演化特征进行了详细研究。结果表明: (1)扎哈泉地区上干柴沟组沉积时期发育辫状三角洲—滨浅湖沉积体系,滩坝砂体发育,岩性主要为岩屑长石细砂岩—极细砂岩,成分成熟度中等—较差、分选磨圆度中等—好,粒度概率曲线以反映波浪作用的两段跳跃式加悬浮式为主;沉积构造类型多样,主要发育浪成沙纹交错层理、波状层理、丘状交错层理和透镜状层理。(2)上干柴沟组沉积时期,研究区滩坝砂体发育规模先增大后减小;早期到中期,滩坝砂体发育规模不断增大,其中近岸坝主要表现为向南和向东2个方向扩张,呈北偏西方向展布,远岸坝主要表现为南北方向扩张,呈近北西—南东方向展布;中期到晚期,滩坝砂体的发育规模不断减小,其中近岸坝主要表现为向南北2个方向收缩并向东扩展,展布方向变为东偏南转东北方向,远岸坝主要表现为南北方向收缩。(3)上干柴沟组沉积时期,研究区古地貌呈西高东低、南北低中间高的特征;从早期到中期,研究区中部古地貌高点不断向东和东南方向大幅度扩展,范围不断扩大;中期到晚期,古地貌高点范围不断向北和北西2个方向收缩,范围缩小;同时,研究区东南角古地貌高点范围不断向北扩大。综合上述分析结果,认为柴达木盆地扎哈泉地区上干柴沟组滩坝砂体发育演化受控于物源规模大小和微古地貌的发育演化,其中微古地貌发育演化是滩坝砂体发育演化的主要控制因素。研究成果可为相似的地质背景下滩坝砂体成因的岩性圈闭预测提供参考。 相似文献
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On the basis of the multi.channel seismic data and the other data, using 2DMove software, the tectonic evolution in three seismic profiles was restored since Pliocene. The tectonic restoration results show that： （1） the initial active center lay in the west slope and then was transferred to east and south via trough center during the evolution process; （2） several main normal faults controlled the evolution of the southern Okinawa Trough; （3） since Late Pliocene, the southern Okinawa Trough has experienced two spreading stages. The early is depression in Early-Middle Pleistocene and the late is back-arc spreading in Late Pleistocene and Holocene, which is in primary oceanic crust spreading stage. 相似文献
10.
Sedimentary basins in the Yellow Sea can be grouped tectonically into the North Yellow Sea Basin (NYSB), the northern basin of the South Yellow Sea (SYSNB) and the southern basin of the South Yellow Sea (SYSSB). The NYSB is connected to Anju Basin to the east. The SYSSB extends to Subei Basin to the west. The acoustic basement of basins in the North Yellow Sea and South Yellow Sea is disparate, having different stratigraphic evolution and oil accumulation features, even though they have been under the same stress regime since the Late Triassic. The acoustic basement of the NYSB features China-Korea Platform crystalline rocks, whereas those in the SYSNB and SYSSB are of the Paleozoic Yangtze Platform sedimentary layers or metamorphic rocks. Since the Late Mesozoic terrestrial strata in the eastern of the NYSB (West Korea Bay Basin) were discovered having industrial hydrocarbon accumulation, the oil potential in the Mesozoic strata in the west depression of the basin could be promising, although the petroleum exploration in the South Yellow Sea has made no break-through yet. New deep reflection data and several drilling wells have indicated the source rock of the Mesozoic in the basins of South Yellow Sea, and the Paleozoic platform marine facies in the SYSSB and Central Rise could be the other hosts of oil or natural gas. The Mesozoic hydrocarbon could be found in the Mesozoic of the foredeep basin in the SYSNB that bears potential hydrocarbon in thick Cretaceous strata, and so does the SYSSB where the same petroleum system exists to that of oil-bearing Subei Basin. 相似文献