Publications

The North Belut Field is a major gas development located in the Block B PSC, South Natuna Sea, Indonesia. The primary producers are the Oligocene Udang and Gabus formations. The field development started in late 2008, with a total of 45 wells drilled to date. The Udang formation is characterized by an interbedded sand-shale interval comprising five subzones separated by shale breaks. Individual sand thicknesses range from a few inches to several feet. The Udang formation is interpreted to have been deposited in a deltaic environment, with thin distributary channel and associated mouth bar sands. To have better knowledge of the reservoir, a number of focused studies of reservoir biostratigraphy (Morley et al 2007), core sedimentology and petrology (Lemigas, 2009), wireline log analysis (log shapes and petrophysics) and seismic stratigraphy were carried out and incorporated. High resolution core information needs to be integrated with well logs, 3D seismic volumes and its attached seismic attributes. Understanding the resolution of the seismic data is important to define the dimension and the geometry of the sedimentary bodies for addressing the complexity of North Belut reservoirs. As more wells have been drilled up to 2017, more new data revealed a better interpretation of depositional environment in North Belut. With better understanding of the reservoir leads to a better development plan for North Belut.