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101.
Ercan Özcan Pratul Kumar Saraswati Ali Osman Yücel Nowrad Ali Muhammad Hanif 《Geodinamica Acta》2018,30(1):137-162
Orthophragminids from the Bartonian Fulra Limestone in Kutch, India and the coeval units in Sulaiman Range in Pakistan suggest the establishment of a significant number of endemic species in the Indian subcontinent (Eastern Tethys). Among a total of fifteen species of Discocyclina, Orbitoclypeus and Asterocyclina, six of them appear to be confined to Indian subcontinent while seven species are common both to the peri-Mediterranean/Europe region (Western Tethys) and Indian subcontinent. Two species, Asterocyclina sireli, a four-ribbed species of possibly Indo-Pacific origin, and Orbitoclypeus haynesi that form large populations in Fulra Limestone, appear to have spread into North Africa and Turkey but not into European platforms as a response to Middle Eocene Climatic Optimum (MECO). The lack of Lutetian and Priabonian fauna in the studied sections, either due to a hiatus or unsuitable depositional environments, hampers the establishment of the actual stratigraphic ranges of the identified taxa. Our record provides us to characterize the orthophragminids in shallow benthic zone (SBZ) 17 for Eastern Tethys in detail by comparing the data from the above localities with those from the North Africa, Europe and Turkey, showing the change in diversity. 相似文献
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在气体介质三轴高温岩石力学实验仪器上,采用意大利Scaglia Bianca石灰岩,在温度50~300℃、围压150MPa,含50MPa孔隙压、无孔隙压含饱和水和完全干燥三种条件下,开展摩擦滑动实验.实验力学数据和显微结构表明,完全干燥样品在120℃时出现慢滑移,实验样品中没有出现溶解与沉淀.无孔隙压含饱和水条件下,100℃、120℃、150℃条件下出现典型的慢滑移,实验样品中含有微弱的溶解与沉淀;300℃条件下出现黏滑,实验样品中出现沉淀.在含50MPa孔隙压条件下,50℃时的实验表现为典型的稳滑,实验样品中以溶解为主;在100~150℃时,出现慢滑移,实验样品中以溶解为主,沉淀为辅;在200~300℃时,出现典型黏滑,实验样品中以沉淀为主.实验结果表明,石灰岩断层泥摩擦滑动稳定性随温度变化,受流体中碳酸钙的溶解和沉淀作用控制,因此,流体中矿物质的饱和度这一化学性质对断层带的摩擦强度和摩擦滑动稳定性具有显著影响. 相似文献
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湘南石灰岩地区找水实践表明:激发极化化法能克服复杂地质、地形条件造成的干扰,较视电阻率法有更明显的异常反映,因而能取得更好的找水效果。 相似文献
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Khawar Ashfaq AHMED Sarfraz KHAN Mahmood SULTAN UMAIR Bin Nisar Kalim ULLAH Al -Hseinat MU’AYYAD 《《地质学报》英文版》2019,93(6):1711-1720
The precise seismic substructural interpretation of the Turkwal oil field in the Central Potwar region of district Chakwal of Pakistan has been carried out. The research work was confined to the large fore-thrust that serves as an anticlinal structural trap through ten 2D seismic lines. A precise seismic substructural model of the Eocene Chorgali Limestone with precise orientation of thrust and oblique slip faults shows the presence of a huge fracture, which made this deposit a good reservoir. The abrupt surface changes in dip azimuth for the Eocene Chorgali Limestone verifies the structural trends and also the presence of structural traps in the Turkwal field. The logs of three wells (Turkwal deep X-2, Turkwal-01 and Fimkassar-01) were analyzed for petrophysical studies, well synthetic results and generation of an Amplitude Versus Offset (AVO) model for the area. The AVO model of Turkwal deep X-2 shows abrupt changes in amplitude, which depicts the presence of hydrocarbon content. Well correlation technique was used to define the overall stratigraphic setting and the thickness of the reservoir formation in two wells, Turkwal-01 and Turkwal deep X-2. The Eocene Chorgali Limestone in Turkwal-01 is an upward thrusted anticlinal structure and because of the close position of both wells to the faulted anticlinal structure, its lesser thickness differs compared to Turkwal deep X-2. The overall results confirm that the Turkwal field is comparable to several similar thrust-bound oil-bearing structures in the Potwar basin. 相似文献
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在观察兴县关家崖野外露头剖面马五_5亚段核形石灰岩岩性特征的基础上,进行了薄片镜下鉴定,开展了全岩X衍射,主、微量元素,锶和碳、氧稳定同位素及有机碳分析。研究结果表明,核形石灰岩形成于开阔海环境,准同生阶段核形石发生重结晶作用,浅埋藏期压实作用使巨晶方解石呈镶嵌接触并产生压力双晶纹;马五_5亚段底部核形石灰岩形成于海平面上升过程,未受早期淡水溶蚀;马五_5亚段顶部核形石灰岩形成于海平面下降过程,明显受早期大气淡水淋滤与溶蚀作用影响;在中—深埋藏阶段受地下热液影响,在水-岩作用过程中发生了同位素交换及有机质成熟及排烃作用。该套核形石灰岩的发现,明确了马五_5亚段形成于开阔海环境,这对于马家沟组烃源岩的研究具有参考意义。 相似文献
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