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Observation and implication of the paleo-cave sediments in Ordovician strata of well lundong-1 in the Tarim Basin

Observation and implication of the paleo-cave sediments in O...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： SUN Shu ZHAO WenZhi ZHANG BaoMin LIU JingJiang ZHANG Jing SHAN XiuQin Institute of Geology and Geophysics Chinese Academy of Sciences Petro China Exploration & Production Company Petro China Research Institute of Petroleum Exploration & Development

well lundong-1 is located in the periclinal area on the eastern flank of the Tahe-Lunnan paleo-uplift in the Tarim Basin.A 25-m-high cave fill sequence was observed in the Upper Ordovician interval of the well at 6800-6825m.A third cut of cores was obtained from the top of the *** following conclusions were obtained by studying the cave sediments and depositional sequence,and by undertaking paleontological and elemental geochemistry *** cave sediments contain abundant brachiopod,gastropod,echinoderm,ostracod,and acritach fossils,which can be classified into two groups:cave autochthonous and cave allochthonous fossils(from collapse breccia dissolution or transportation by underflow).The fossils indicate that the cave was formed before the Carboniferous and partly-filled and buried during Carboniferous resubsidence.2. Elemental geochemistry shows that the mud that filled the cave is sourced from calcareous paleo-soil and weathered crust that came from a salty environment with poor water *** formation and evolution of the cave occurred in three stages The first stage occurred after the deposition of the Late Ordovician Lianglitage Formation,the second stage took place after the deposition of the Late Ordovician Sangtamu Formation,and the last stage happened after Silurian *** dissolution occurred in the latter two stages as a result of bedding-confined deep underflow *** on the reconstruction of the cave formation history,favorable paleokarst targets can be predicted and estimated to aid paleogeography and paleokarstology studies.

关键词： cave filling and depositional sequence cave autochthonous fossils cave allochthonous fossils bedding karst well lundong-1 Tarim Basin

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