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Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Mahu sag is an important hydrocarbon-rich sag and a large stratigraphic lithologic reservoir exploration field in the northwestern Junggar Basin, forming a large stratigraphic lithologic reservoir with multiple layers. In order to find out the distribution law of oil and gas in this area and provide geological basis for the next exploration deployment, based on core observation and comprehensive analysis of seismic, logging and other data, the structural sequence analysis method was applied to study the main oil and gas reservoir series from Permian to Triassic. The results show that there are many large stratigraphic unconformity surfaces from Permian to Triassic in Mahu sag, which can be divided into Lower Permian, Middle Permian, Upper Permian-Triassic and other structural sequences. From Permian to Triassic, it experiences three major evolution stages of fault depression, depression and large depression slope, forming the superposition of three major structural sequences. The Lower Permian is a dustpan structural sequence formed under the extensional tectonic background; the northern stratum is thick, and the southern stratum is thin; it is deposited under the dustpan structure background of deep north and shallow south; the depression area is widely distributed fine-grained mixed rock, which is constructed of high-quality hydrocarbon source rock, and gradually becomes sandstone and conglomerate towards the slope area. The Middle Permian is a structural sequence with thick central and thin peripheral margins under the tectonic background of depression; the basin margin fan delta is developed, which is characterized by large basin, shallow water, limited basin margin fan body, and interbedded sediment of sand and mud in the basin. In Upper Permian-Triassic, Mahu area is located in the northwest slope area of Junggar large depression basin; under the background of shallow water, gentle slope and lacustrine transgression, the large retrogressive fan delta deposits are formed, and the sand bodies are vertically superimposed and horizontally distributed. The vertical superposition of the three major structural sequences forms the multi-layer distribution of stratum-lithologic or structure-lithological reservoirs in the area. [ABSTRACT FROM AUTHOR]

Copyright of Acta Sedimentologica Sinica is the property of Acta Sedimentologica Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas Geoscience is the property of Natural Gas Geoscience and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Special Oil & Gas Reservoirs is the property of Special Oil & Gas Reservoirs Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas Geoscience is the property of Natural Gas Geoscience and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

According to petroleum exploration data and previous results,the structures of Tarim Basin, Junggar Basin, Qaidam Basin and the basin groups of Alxa-Hexi Corridor-Middle Qilian in the north of Kunlun orogenic belt and the west of Helan mountain structural belt were analyzed. The results show that those basins,which are superposed and transformed in many periods, exist on the stable plate(block), and have different types in different periods; Northwest China is in the paleo Asian tectonic zone from Sinian period to Paleozoic, basins are formed and disappeared by the open and closure between plates (blocks) during that time,to Mesozoic, Northwest China becomes part of Eurasian continent, the formations of basins and mountains are affected by Tethys ocean and the deep tectonic background, the far distance effect produced by the collision of India plate and Eurasia plate in Cenozoic forms the present basin-mountain structure; the interaction effects between the deep tectonic and basin, between the deep tectonics of basin and orogenic belt, and between the shallow basin and orogenic belt, form the foundation of the basin dynamic evolution in Northwest China; petroliferous basins in Northwest China experience two basin evolution stages, that is, the ocean continent transformation and the intra continental evolution; the key tectonic events about the basin formation and disappearance reconstruction are consistent in the north of Xinjiang, Tarim Basin, Qaidam Basin and the basin groups of AlxaHexi Corridor-Middle Qilian during the basin evolution periods; controlled by the regional geotectonics, there are significant differences between the sedimentary formation and the characteristics of tectonic activity in Junggar Basin, Tarim Basin and the east area of Arkin tectonic belt; the regional geotectonics control the development regions and strata of source rocks in the basin, form paleo uplifts and piedmont tectonic belts with different characteristics, and make the oil and gas accumulation controlling factors different in each basin. [ABSTRACT FROM AUTHOR]