Abstract
Based on the data of element geochemistry, electron probe, tectonic attributes, etc., the composition of the clastic and parent rock in the source area was analyzed for the Yanchang Formation in Longdong area. Research shows that the Yanchang Formation includes single crystal quartz, polycrystalline quartz, bicyclic quartz, fragmented quartz, dust-rich turbid quartz, and wavy matte quartz. Different types of quartz come from different parent rocks in different areas of the basin. Feldspar mainly comes from Guanshan pluton, Cuihua mountain, Haiyuan, and Longxi intermediate acid biotite granite in the periphery of the basin. In the Yanchang Formation in the study area, most of the heavy minerals in the sandstone formed by the northeast provenance come from the metamorphic parent rock in the Yinshan area, while the heavy minerals in the sandstone formed by the southwest provenance are formed in the hydrothermal metamorphic parent rock. The content of heavy minerals varies greatly in different depositional stages, and the provenance direction of sandstone in different intervals and the type of parent rock in the source area vary. The cuttings particles have a long transport distance, fine particle size, little cuttings retention, poor stability of rock structure and composition, weak resistance to weathering, and low cuttings content.
Highlights
The study of sedimentary characteristics of lake basins has always been one of the key contents of petroliferous basin research [1,2,3]
The clastic comparison method refers to the comparison of the type and content of the clastic composition of the sandstone in the sedimentary basin with the possible parent rock composition at the periphery of the basin, and more importantly, by studying the characteristics of quartz, feldspar and cuttings, restore their provenance direction and parent rock [15]
In the statistical analysis of the composition, typomorphic characteristics, and content characteristics of the quartz, He Taping and Yun Yuping: A Comparative Study on the Composition of the Clastic and the Parent Rock of the Source Area in the Yanchang Formation in the Longdong Area of the Ordos Basin feldspar and other debris particles in the Yanchang Formation in the study area, it was found that quartz in the Yanchang Formation sandstones can be monocrystalline, polycrystalline, bicyclic quartz, fragmented quartz, dust-rich turbid quartz, and wavy matte quartz, depending on the source direction and the genetic type of the parent rock in the source area
Summary
The study of sedimentary characteristics of lake basins has always been one of the key contents of petroliferous basin research [1,2,3]. During the extended period of the Late Triassic, the Longdong area was at the center of the southwest subsidence of the Ordos Lake Basin This area has a large stratum thickness, strong sedimentary rhythm, complex rock composition, many oil-bearing layers, and abundant reserves. It is the most enriched and most representative area of low-permeability and ultra-low-permeability reservoirs in the basin, and has very broad prospects for exploration and development [8,9,10,11]. Facts have proved that the quartz, feldspar and cuttings comparison method is a conventional and effective method
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
