|Table of Contents|

Reconstruction of Late Precambrian Palaeogeomorphology in Ordos Basin, China and Its Control on Source Rocks(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第04期
Page:
475-490
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Reconstruction of Late Precambrian Palaeogeomorphology in Ordos Basin, China and Its Control on Source Rocks
Author(s):
HOU Lin-jun1; 2;  CHEN Hong-de1; 2*;  LUO Lin-jun3;  ZHANG Cheng-gong1; 2;  ZHAO Jun-xing1; 2;  SU Zhong-tang1; 2
(1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 3. No.1 Oil Recovery Plant, Changqing Oilfield Company, PetroChina, Yan’an 717400, Shaanxi, China)
Keywords:
paleogeomorphology;  Precambrian;  sequence;  marker bed;  impression method;  paleogeological map;  source rock;  Ordos Basin
PACS:
P531; P931
DOI:
-
Abstract:
Late Precambrian paleogeomorphology in Ordos Basin controls spatial and paleogeographic distributions of the subsequent sedimentary system. Cambrian sequence stratigraphic framework in Ordos Basin was established by outcrop observation, core description and logging data. The largest sea surface of Cambrian SS1(late sedimentary strata of Xuzhuang Formation)was selected as the marker bed; combined with the means of the residual thickness impression method and paleogeological map analysis, the Precambrian paleogeomorphology in the area was reconstructed; meanwhile, the sedimentary background, tectonic framework and provenance direction in Precambrian were defined. Generally, Ordos Basin in Precambrian is bordered by Qinling-Qilian Sea and Xing’an-Mongolian Sea in the north and south, and is clamped by Helan aulacogen and Shanxi-Henan-Shaanxi aulacogen in the east and west. The palaeogeomorphology in Ordos Basin is characterized by the higher in the northeast and the lower in the southwest, and greatly affected by Qinling-Qilian Sea; and it can be divided into three palaeotectonic geomorphic units, including the high-land denudation area, the depression area controlled by palaeotectonics and the slope terrace located in the transition zone between denudation and deposition. By studying Late Precambrian paleogeomorphology and the distribution of Early Cambrian source rocks, it is considered that depression belts in the background of tensile activity and slope belts are favorable blocks for the development of Early Cambrian source rocks in Ordos Basin, and the Precambrian palaeogeomorphology pattern affects the development and distribution of Early Cambrian source rocks. The reconstruction of paleogeomorphology is of great significance for revealing the source supply, studying the sediment transport and characteristics of horizontal and vertical distributions, exploring the migration law of sedimentation and subsidence centers, and further revealing the source-reservoir-cap assemblage and distribution.

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Last Update: 2019-07-11