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Ridd M.F.,43 Prospect Quay | Morley C.K.,PTT Inc
Proceedings of the Geologists' Association | Year: 2011

A study of Google Earth images has revealed a hitherto-unrecorded gently curved lineament within the southern marginal zone of the Khorat Plateau in eastern Thailand. The lineament, confirmed by digital elevation model (DEM) images, is at least 130. km long and coincides with a dip reversal of the Mesozoic Khorat Group. It is interpreted here as a fault, named the Khao Yai Fault, and it has characteristics which make it unusual within the Khorat Plateau. The fault forms the northern boundary of a belt of several ENE-WSW trending fault splays which are thought to link with the Mae Ping Fault further south; this is interpreted as a left-stepping, sinistral strike-slip duplex about 50. km wide and 150. km long. Apatite fission track data indicate that exhumation began during the earliest Palaeogene.The Khao Yai Fault is considered in its regional context which includes the Cardamomes Mountains of Cambodia, the offshore Phuquoc-Kampot Basin, and the Khao Thalai Red-beds outlier of the Khorat Group in Southeast Thailand. The latter is interpreted as a down-faulted sliver of the Khorat Group in the Tha Mai Fault belt which is thought, in turn, to be a splay of Thailand's other major regional fault, the Three Pagodas Fault. Carboniferous, Permian and Triassic shallow-marine rocks with unusual faunas occur in a limited NNW-SSE trending zone to the west and NNW of the Tha Mai Fault and it is suggested that wrench movement on the fault played a part in the emplacement of these rocks. © 2010 The Geologists' Association. Source


The Semanggol Formation of NW Peninsular Malaysia is a Middle Permian-Late Triassic sequence of predominantly radiolarian chert, sandstone and mudstone (including turbidites), and conglomerate. The belt of country occupied by this unit extends into Thailand where various names including Na Thawi formation have been applied to its correlatives. Fossil evidence, particularly radiolarian, has established its age but also revealed that it is tectonically complex, with numerous out-of-sequence slices interpreted here to be caused by thrusting.The model proposed here involves, initially, in the Middle Permian, accumulation in the oceanward part of an accretionary complex as Palaeotethys began subducting beneath Indochina/East Malaya. This regime, it is proposed, continued until about the end of the Middle Triassic when Sibumasu collided with Indochina/East Malaya bringing an end to subduction. But as crustal shortening continued into the Late Triassic a foredeep basin formed in front of the now-inactive subduction zone and accretionary complex, and the youngest part of the Semanggol Formation was deposited. During this final stage the whole package of rocks comprising those in the accretionary complex and those deposited in the foredeep basin underwent lateral compression resulting in a thrust complex.The Semanggol Formation and its Thailand correlatives occupy part of a N-S belt of imbricately-thrust, deeper-water, sediments which include slope-deposited Carboniferous and Lower Permian beds. That belt is interpreted as a series of thrust slices juxtaposing rocks of different ages, referred to here as the Songkhla-Semanggol terrane. Its western boundary is a N-S line of inferred thrusting which coincides with a major westward facies change to platform carbonates of Middle Permian to Late Triassic age, called here the Rattaphum-Kodiang tectonic line. © 2012 Elsevier Ltd. Source


Ridd M.F.,43 Prospect Quay | Racey A.,Andy Racey Geoscience
Geological Society Memoir | Year: 2015

Before the birth of the modern, mechanized, petroleum industry, Myanmar (formerly Burma) was an exporter of oil products from its hand-dug wells in the centre of the country. It is now an important exporter again, but of gas from its offshore fields, and the international petroleum companies are keen to obtain acreage both onshore and offshore; in the lead-up to the 2013 offshore round no fewer than 60 companies pre-qualified with the Ministry of Energy of the Myanmar government. © 2015 The Authors. Published by The Geological Society of London. All rights reserved. Source


Racey A.,Andy Racey Geoscience | Ridd M.F.,43 Prospect Quay
Geological Society Memoir | Year: 2015

While the focus of this volume is Myanmar, some of the basins that are the subject of earlier chapters extend into adjoining countries or their offshore exclusive economic zones (EEZs). In this chapter we look briefly at the progress of exploration in adjoining areas of India (the Andaman Islands), Bangladesh and Thailand. We see that success has so far eluded exploration in Thailand's EEZ and that of the Andaman Islands, despite seismic and drilling activities over several decades. On the other hand, north from Myanmar's Rakhine Basin (offshore and onshore) in Bangladesh, substantial gas reserves have been discovered and developed. © 2015 The Authors. Source


Racey A.,Andy Racey Geoscience | Ridd M.F.,43 Prospect Quay
Geological Society Memoir | Year: 2015

Rakhine (formerly Arakan) is the name of the Myanmar state that extends almost the whole length of the Bay of Bengal coast from the Bangladesh border south to about latitude 17°30', and inland to the watershed of the Indo-Burman Ranges. The Myanmar government adopted the name for the northernmost of its offshore petroleum regions, and their Rakhine Region comprises the offshore blocks A1-A7 and deep-water blocks AD1-AD16 (Fig. 9.1). Much of that offshore region is occupied by the Rakhine Basin which also extends onshore beneath the Rakhine Coastal Lowlands, and this chapter discusses the petroleum geology of both the Rakhine Region (i.e. offshore) in which the Shwe gas field is located and the Rakhine Coastal Lowlands (onshore) in which a number of small oil discoveries have been made. The Rakhine Coastal Lowlands represents the southwards extension of the hydrocarbon-bearing regions of Assam and eastern Bangladesh. The offshore Rakhine Region covers an area of 170 000 km2 and has a Tertiary clastic sedimentary fill of several kilometres. The Rakhine Basin is subdivided into: (1) a structurally complex onshore and offshore shelf area; and (2) a poorly structured deepwater area. The two are separated by a dextral trench-parallel shear fault system which represents the boundary between the India Plate in the west and the Burma Platelet in the east. © 2015 The Authors. Source

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