Publications

Within the JS-1 Ridge oil and gas province, reservoirs are dominated by Oligocene – Miocene Carbonate systems, which have been explored and have produced hydrocarbons since the early 80’s. Nowadays, the challenges are to image and map the deeper and older reservoirs which are seismically challenged due to the noise and pull-up effect from the shallower and younger Oligocene – Miocene Carbonate build-ups. One of the sequences that has been overlooked is the thick Early Oligocene Limestone sequence known as Ngimbang-3500, which has become a regional marker in the JS-1 Ridge area. It is characterized by a continuous high-amplitude which covered the JS-1 Ridge area. Most of the wells are showing that the carbonate did not preserve good reservoir properties, except one well KE-XX-64 which has oil shows within the Ngimbang-3500 interval and it appears to have thin-bedded sandstone overlain the Ngimbang Limestone. However, the objective of this paper is not to reconstruct the development of the carbonate build-ups of Ngimbang 3500. This paper will focus on the seismic geomorphology of the new findings of an untested Incised Valley Fill system within the thick Ngimbang 3500 Carbonate sequence. The new 3D seismic volumes which were acquired in 2014 and then processed by applying the HFQCBM PSDM method confirm that the area of study contains the Northwest – Southeast continuation of Incised Valley Filled system of Ngimbang 3500 age. This system has not been tested in JS-1 Ridge area. In this paper, the Incised Valley Fill (IVF) and the associated depositional elements are described using the Full Stack PSDM and Acoustic Impedance Inversion seismic volumes.