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Distribution of Nanhua-Sinian rifts and proto-type basin evolution in southwestern Tarim basin, NW China

Petroleum Exploration and Development 2020年第6期47卷 1206-1217页

作者： TIAN Lei ZHANG Huquan LIU Jun ZHANG Nianchun SHI Xiaoqian Research Institute of Petroleum Exploration&Development-Northwest PetroChinaLanzhou 730020China Reservoir Description Key Laboratory of China National Petroleum Corporation Lanzhou 730020China

Based on seismic data,outcrop evidence,logging data and regional aeromagnetic data,the distribution of Nanhua–Sinian rifts in the southwestern Tarim basin was analyzed,and on the basis of restoration of lithofacies paleogeography in different periods of Neoproterozoic–Cambrian,the evolution model of the proto-type rift basin was *** Neoproterozoic Rodinia supercontinent split event formed the trigeminal rift system at the edge and inside of the craton in the southwestern Tarim basin located in the Kunlun piedmont and Maigaiti *** rift in Kunlun piedmont zone was distributed along the E-W direction and was the oceanic rift in the trigeminal rift *** decadent rifts in N-E strike developed in the Luonan and Yubei areas of Maigaiti slope,and the interior of the rifts were characterized by a composite graben-horst structure composed of multiple grabens and *** Neoproterozoic–Cambrian proto-type basin evolution in the southwestern Tarim basin can be divided into three stages:rift in the Nanhua,embryonic passive continental margin in the Sinian,and stable passive continental margin in the *** the regional tectonic movements in the end of Nanhua and Sinian,the tectonic framework of the southwestern Tarim basin had not changed significantly,the sedimentary center of Nanhua rift basin showed the characteristics of succession in the Sinian–Early *** Nanhua rift in Kunlun piedmont evolved into a craton marginal depression during the Sinian–Early Paleozoic,while the Luonan decadent rift in the midsection of Maigaiti slope evolved into a sag inside platform in Early Cambrian,constituting the paleogeographic framework of"two paleouplifts and one sag"with the paleouplifts in east and west sides of the *** later evolution of the Luonan decadent rift in the midsection of the Maigaiti slope formed two sets of reservoir-forming assemblages,the Sinian and the Lower Cambrian ones,which are important exploration targets in future.

关键词： rift Nanhua-Sinian Early Cambrian proto-type basin southwestern Tarim basin

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Tectonic types and evolution of Ordovician proto-type basins in the Tarim region

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Science Bulletin 2007年第S1期 164-177页

作者： HE DengFa1, ZHOU XinYuan2, ZHANG ChaoJun3 & YANG XiaoFa1 1 Energy Resources School, China University of Geosciences, Beijing 100083 2 PetroChina Tarim Oilfield Company, Korla 841000, China 3 Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

The Ordovician system is an important target for exploration in the Tarim basin. Restoration of the Ordovician tectono-depositional environment is a key basis for the study of the structural development history in Tarim block and the prediction of the favorable Ordovician reservoir belts (zones). Based on the surrounding tectonic settings, the litho-facies and sedimentary fill, the palaeo-geography, palaeoclimate and palaeo-ecology, and the structural deformation and magmatic eruptions, in this paper we combine the sedimentary fill in the basin with the development of the surrounding orogenic belts and re-build the proto-type basins of the different Ordovician periods. During the Ordovician period, the Tarim region was characterized by the composite of the interior cratonic depression with the peripheral cratonic depression. The interior cratonic depression in the central and western parts is mainly the depositional area of the platform facies while the peripheral cratonic depression in the eastern part is mainly the zone of deepwater basin facies, with the slope acting as the transition belt between them. During the Late Ordovician period, the closure of the Northern Kunlun Ocean and destruction of the trencharc-basin system in the Altyn Tagh region put the southern part of the Tarim block under compression and uplifting and turned the central and western parts of the carbonate platform into the mixed depositional continental shelf. The eastern region of the basin had the over-compensated flysch sedimentation with huge thickness, marking the drastic turn of the basin nature. The basin tectonic framework turned to the south-north differentiation of the Silurian period from the east-west differentiation of the Ordovician period.

关键词： Ordovician period proto-type basin composite basin basin evolution Tarim block

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