|Table of Contents|

Main controlling factors and models of gas accumulation in Back-arc Depression of Andaman Sea, Burma(PDF)

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

Issue:
2012年第01期
Page:
29-34
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Main controlling factors and models of gas accumulation in Back-arc Depression of Andaman Sea, Burma
Author(s):
XU Si-huang1;  ZHENG Dan1;  ZHU Guang-hui2;  YANG Song-ling2;  LI Chao1;  YANG Chuan-chao1
1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, Hubei, China; 2. Overseas Assessment Center, CNOOC Research Institute, Beijing 100027, China
Keywords:
gas;  main controlling factor;  accumulation model;  active continental margin;  Back-arc Depression;  Andaman Sea;  Burma
PACS:
P618.130.2
DOI:
-
Abstract:
Andaman Sea in Bruma is one of the major foreign exploration regions for oil companies of China. Controlled by multiple episodes of oblique subduction of Indian Plate to Eurasian Plate and western Burma micro-block, the tectonic attribution of this block evolved from passive continental margin, then transitional continental margin and last to active continental margin, with extremely complex basin structure and hydrocarbon accumulation. The main controlling factors of hydrocarbon accumulation were summarized by analyzing the source rock, reservoir, trap, migration pathway and the histories of hydrocarbon generation, migration and accumulation in Back-arc Depression of Andaman Sea. There were three sets of hydrocarbon source rocks in this depression, including mature rocks in Oligocene-Lower Miocene and Middle Miocene and bio-gas rocks in Pliocene. The reservoir conditions of carbonate reefs on island arc and sandbodies on slope were favorable. The capacities of faulted anticline traps developed on inheritable palaeohigh in the eastern and western slopes were large. High-angle extensional faults and connective sandbodies were the main pathways of hydrocarbon migration. Considering the features of hydrocarbon generation, migration pathway and trap types, two types of accumulation models were established: one was biogas or mixed gas migrated vertically and accumulated mainly within fault block traps in shallow layer of central sag zone; another was thermogenic gas migrated laterally and accumulated mainly within anticlinal and lithological traps in the eastern slope and western slope and island arc zone. The results suggested that carbonate reefs on the western slope and island arc and large faulted anticline trap on inheritable palaeohigh in the eastern slope could be the favorable exploration targets.

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Last Update: 2012-03-20