|Table of Contents|

Characteristics of Sequence-lithofacies and Paleogeography of Devonian in Block 438B of Oued Mya Basin, Algeria(PDF)

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

Issue:
2011年第03期
Page:
268-274
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Characteristics of Sequence-lithofacies and Paleogeography of Devonian in Block 438B of Oued Mya Basin, Algeria
Author(s):
PAN Yang-hui1; 2; ZHENG Rong-cai1; HU Cheng1; ZHAO Can1
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059, Sichuan, China; 2.Sichuan Institute of Nuclear Geology, Chengdu 610061, Sichuan, China
Keywords:
sequence;  lithofacies and paleogeography;  reservoir;  Devonian;  Oued Mya Basin;  Algeria
PACS:
TE122.3+4;P539.2
DOI:
-
Abstract:
Block 438B is located in the northwest of Oued Mya Basin, Algeria. Devonian stratum is one of the important oil-bearing formations in Block 438B.The stratum is divided into 2 three-order sequences, and only SQ1 sequence in the lower part is intact; Devonian stratum is rapid transgression-slow regression cycles, and is composed of TST, EHST and LHST. The stratigraphic units for the equivalent system tracts are very isochronous in SQ1 sequence, the structural high only outside the east and south part of the research area is thin or lose TST stratum. The comparability of barrier sand bank for EHST is better in vertical for all the system tracts, so the developing stratum and deposition thickness of barrier sand banks for EHST are more stable, and the connectivity and reservoir property of sandbodies are better, but SQ2 in the upper part is residual sequence only recording part sedimentary of TST. All the system tracts of SQ1 sequence are taken as isochronous stratigraphic units in order to draw the paleogeography map of sequence-lithofacies. The results show that there are estuarine physiognomy and zonation sedimentary, which distribut from northwest to southeast and is composed of shallow-sea continental shelf, barrier island, lagoon and tidal flat, during Devonian of Block 438B; barrier sand bank and washover fan in EHST are the most favorable reservoir facies in the zonation sedimentary pattern with inherited evolution of all the system tracts.

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Last Update: 2011-09-20