|Table of Contents|

Finely Outcrop Analysis of Deep Water Sandstones from Yanchang Formation in Zichang Area of Ordos Basin, China(PDF)

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

Issue:
2019年第04期
Page:
491-504
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Finely Outcrop Analysis of Deep Water Sandstones from Yanchang Formation in Zichang Area of Ordos Basin, China
Author(s):
JIANG Jian123 ZHAO Jun-feng12* LI Yuan14
(1. Department of Geology, Northwest University, Xi’an 710069, Shaanxi, China; 2. State Key Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, Shaanxi, China; 3. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China; 4. No.1 Natural Gas Plant, Changqing Oilfield Company, PetroChina, Jingbian 718500, Shaanxi, China)
Keywords:
deep-water deposition turbidite sandstone outcrop lithofacies bounding surface hierarchy architectural element Yanchang Formation Ordos Basin
PACS:
P586
DOI:
-
Abstract:
The deep lacustrine turbidite sandstone widely develops in Chang-1 interval of Triassic Yanchang Formation, and well exposes in Zichang area of the central Ordos Basin. Based on outcrop observation, the deep lacustrine turbidite sandstone was finely analyzed to study the sedimentary architectural elements of the lacustrine turbidite sandstone. 7 different types of lithofacies, including massive sandstone facies(Sm), massive sandstone facies with teared intraclasts(Smt), parallel bedding sandstone facies(Sh), ripple cross bedding siltstone facies(Fr), contemporaneous deformed structural siltstone facies(Fd), horizontal lamination siltstone facies(Fl)and mudstone facies(Fm), were summarized in Chang-1 interval of Zichang area; and 3 kinds of architectural elements, including channel(CH), levee(LV)and lobe(LB), were recognized. The channel architectural elements can be further divided into 4 types according to their vertical association of lithofacies and spatial distribution characteristics, which correspond to different parts of turbidite fan. In the upper fan area, channel Ⅰ(Smt-Fm-Sm)is developed, and the lateral extensibility of sand body is limited. The middle fan area is mainly composed of channel Ⅱ(Sm-Sh-Fr-Fl-Fm)and channel Ⅲ(Sm-Fr-Fl-Fm); the two types of sandbodies have very large extensibility and are the main components of deep-water sandbodies of Chang-1 interval in Zichang area. In the lower fan area, channel Ⅳ(Sm-Fl-Fm)with poor lateral extensibility is developed. According to the distinction of different types of channels, the depositional model for deep water sandstones of Chang-1 interval in Zichang area was preliminarily proposed.

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Last Update: 2019-07-11