Sequence analysis (Sequence Stratigraphy)

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Sequence stratigraphy was used to identify the Lower LST facies in the clastic Pliocene-Pleistocene shelf sediments in Southeast Asia. The Lower LST facies corresponded to conditions of sandy material accumulation within the middle part of the shelf, to which stratigraphic traps could be related. They were mapped within the middle part of the shelf slope, where gas deposits developed within its deep part in low-pore reservoirs. Later, an electromagnetic survey line was acquired through the prospects identified on the basis of this approach and also through the already discovered gas deposits, which showed an increase in resistivity (see pic.) within the prospects even more prominent than even within the proven accumulations.