Successful Production of Tight Sands (Cretaceous) in "Block I" and New Opportunities of Development in "Block IV" – Talara Basin, Peru

Abstract

Cretaceous formations in Talara basin have not been developed successfully, and little explored until 2012 in which GMP in Block I generates a profitable development with 48 wells based on geological characterization, and treatment in stimulation as a non-conventional reservoir (tight sands), focusing on the chemical and physical composition of the reservoir. This paper focuses on describing the development of the Mesa formation of Block I and its analogy with Block IV in order to generate a new discovering and development for this Cretaceous formation. After the acquisition of two cores, the permeabilities of the reservoir rock was + - 0.1 mD. The chemical composition of the clays and the diagenetic sequence were determined to explain the poral distribution. The high iron content of the clays reacted with the type of completion fluid that was being used, which is why it was changed. Apart from that also determined young module and poisson coefficient of the rock and found that the type of sand in the completion was not adequate. These changes made the productive behavior of this formation profitable and later developed in Block I. Wells 5745 and 4215 of Block IV (drilled in the 60's) have found interesting electrical and lithological logs with fluorescence in Mesa Formation, which have been completed without commercial results. Stratigraphic correlations are made between the wells of Block I and Block IV, determining the continuity of an intermediate marker in Mesa Formation. Based on the electrical log of spontaneous potential and resistivity, synthetic records are generated to calculate the porosity for wells 5745 and 4215. 3D structural model for Mesa Formation is generated and geostatistical distribution adjusted to the regional sedimentary model of the petrophysical properties: net sand and porosity. To determine reserves and the initial flow by analogy of reservoirs, the data from Block I will be taken (Effective permeability, pressures, well damage, fluid parameters).The drilling of 03 pilot wells has been recommended, which will be drilled in the 2018/2019 drilling campaign, with which the development in Block IV will be activated by Mesa Formation. The results for this first stage with 03 pilot wells as a single project have positive NPV with a return period of 4 years, results that would improve with the increase in the price of oil and the reduction of costs.

AAPG Datapages/Search and Discovery Article #90332 © 2018 AAPG International Conference and Exhibition, Cape Town, South Africa, November 4-11, 2018