Late Mesozoic Structural and Petrophysical Analysis of Kadanwari, Middle Indus Basin, Pakistan (T-1396) (MFN 5640)

Abstract

The Purpose of this study is to unveil the reservoir properties of Lower Goru sands of Kadanwari area in order to estimate the reservoir potential by carrying out Formation Evaluation technique, supported by computer generated attributes, and understand the general structural framework through integrated approach of seismic interpretation. The Kadanwari area belongs to the Middle Indus Basin where the stratigraphic sequence ranges from middle Jurassic to upper Pliocene ages. The area has been subject to complex deformation and declared to be evolved in three main tectonic events i) The Cretaceous uplift of Kadanwari area towards north and west. ii) The sets of basement-rooted wrench faults oriented in north-west to south- east fashion in late Paleocene to early Eocene age. iii) The large scale basin inversion associated with basement related structural elements. The study area is structurally derived by normal and transtensional nature of forces which exhibits deep rooted and vertical to sub-vertical faults. The petroleum system in the area is proven and productive as there are several producing fields nearby. A base map of scale 1:340699 has been produced using KINGDOM 8.4 seismic workstation in order to carry out the seismic interpretation. Due to data quality constraints, only Kadanwari-3 and Kadanwari-10 well data have been used to run the petrophysical analysis of the study area. The horizons marked are Sui main Limestone, Upper Goru, Lower Goru, E and D Sands, (Based on ENI nomenclature of Lower Goru sand intervals) and Chiltan Limestone. Time and depth maps have been prepared to acknowledge the extent and dynamics of the structure at reservoir level which shows that the horizons are deepening towards east and south of the study area and general trend of the faults lie in north-west to south-east direction over the study area making structural-cumstratigraphic traps. The Petrophysical analysis has been conducted for E sand intervals in both Kadanwari-3 and Kadanwari-10 to test their hydrocarbon potential and carry out their evaluation. In both wells the E sand interval have been declared as the effective gas producing reservoir due to its high porosity-permeability and low water saturation as compared to other sand intervals.