Sedimentary Characteristics of Upper Paleozoic Mixed Deposits in Southeastern Ordos

doi:10.11885/j.issn.1674-5086.2016.10.20.02

Abstract

Abstract: To identify the mixed sedimentary characteristics of the Benxi and Taiyuan formations in the southeastern part of the Ordos Basin, research was performed on mixed carbonate-clastic sedimentary layers using information derived from the region's geology, and data obtained from well logging/drilling and rock cores. Results indicate that the Benxi-Taiyuan formations are land and sea transitional facies deposits with barrier coasts, as well as mixed sediments. Lithologically, the mixed sediments in the Benxi Formation are mainly comprised of clastic rocks and limestone sandwiched between coal seams, while the Taiyuan Formation is mainly composed of argillaceous limestone and coal seams. The mixed sediment facies developed in the Benxi Formation include mixed tidal flat sediments, mixed lagoon sediments, and mixed barrier bar sediments, whereas mixed platform sediments were developed in the Taiyuan Formation. It was concluded on the basis of the region's sedimentation data that there were two modes of assemblage for the sedimentary facies:mixed barrier coast facies (developed in the Benxi Formation) and mixed continental shelf sedimentary facies (developed in the Taiyuan Formation). The main factors affecting the development of mixed sediments and their mode of assemblage were found to be tectonics, changes in sea level, and climate; in particular, mixed sedimentation was mainly caused by Multi level marine transgressions. Rich-source rocks, high-quality reservoirs, and multiple reservoir-caprock assemblages within the Benxi Formation were developed from these mixed sedimentary layers, and are highly favorable strata containing rich reserves of oil and gas.

Key words: Ordos Basin, Upper Paleozoic, mixed sedimentary layers, mode of sedimentation

CLC Number:

TE122

LIU Guizhen, ZHANG Dandan, LI Pan. Sedimentary Characteristics of Upper Paleozoic Mixed Deposits in Southeastern Ordos[J]. 西南石油大学学报(自然科学版), 2018, 40(2): 25-34.

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