INTEGRATED PETROPHYSICAL AND GEOLOGICAL APPROACH IN FORMATION EVALUATION OF 4 PETROLIFEROUS FIELD IN CAMBAY BASIN

Abstract

Integrated approach encompassing various sub disciplines of geosciences is the key to improve accuracy in formation evaluation and reserve estimation. Formation evaluation is a basic task in exploration for hydrocarbons, which can be quite challenging and difficult in case of complex lithology. A comprehensive evaluation of complex lithology formations requires precise knowledge of types of different minerals present in such Formations to account for their implications on the reservoir parameters to be derived from log data. This is achieved by various laboratory measurements on the core samples. The integration of results from various studies including sedimentological, petrophysical and geochemical etc. on the core samples provide necessary inputs for realistic formation evaluation. The present work deals with an integrated natural gamma ray spectroscopic (N CS), sedimentological, geochemical, petrophysical and workstation based studies on the core samples and core plugs of Chhatral member-Limbodara field. The study has attempted and targeted to provide all the important and prior parameters necessary for realistic formation evaluation of hydrocarbon bearing zones in Limbodara field. Various such important parameters are dominant clay minerals, range of porosity and permeability values, heavy mineral analysis and type of depositional environment along with total organic carbon (TOO) versus Uranium relationships.