Late Paleozoic Sedimentary System and Paleogeographic Evolution of Ordos Area

Guo Yinghai; Liu Huanjie; Quan Biao; Wang Zecheng; Qian Kai

Based on the synthetic study of field outcrops and drilling section data, and using new stratigraphic division program, this paper proposes that the paleogeographic pattern of Ordos area was the compound sedimentary system of epiric sea carbonate platform-clastic barrier island-shallow water delta. Influ-enced by aeral tectonic backg round, the late-Paleozoic basin filling included four stages from the filling of the rift bay basin coexisting with shallow-rifting epiric sea, the filling of epiric sea, the filling of par-alic inland sea to the filling of inland lake depression. The evolution of areal paleogeographic pattern was from the compound system deposition of epiric sea carbonate platform-clastic barrier island-shallow wa-ter delta to delta-fluvial system deposition and at last the fluvial-lake system deposition. The develop-ment of sandy reservoir body was controlled by sedimentary envoronments. The sand bodies mainly dis-tribute in the central and northern parts of Ordos area, and mainly the fluvial-delta sand bodies.

1. China University of Mining and Technology Xuzhou Jiangsu 221008;

2. Langfang Branch, Scientific Research Institute of Petroleum Exploration and Development, CNPC, Langfang Hebei 102801

Received Date: 1997-09-24

Rev Recd Date: 1998-01-22

Publish Date: 1998-12-10

Key words:

Abstract: Based on the synthetic study of field outcrops and drilling section data, and using new stratigraphic division program, this paper proposes that the paleogeographic pattern of Ordos area was the compound sedimentary system of epiric sea carbonate platform-clastic barrier island-shallow water delta. Influ-enced by aeral tectonic backg round, the late-Paleozoic basin filling included four stages from the filling of the rift bay basin coexisting with shallow-rifting epiric sea, the filling of epiric sea, the filling of par-alic inland sea to the filling of inland lake depression. The evolution of areal paleogeographic pattern was from the compound system deposition of epiric sea carbonate platform-clastic barrier island-shallow wa-ter delta to delta-fluvial system deposition and at last the fluvial-lake system deposition. The develop-ment of sandy reservoir body was controlled by sedimentary envoronments. The sand bodies mainly dis-tribute in the central and northern parts of Ordos area, and mainly the fluvial-delta sand bodies.

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Late Paleozoic Sedimentary System and Paleogeographic Evolution of Ordos Area

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