Schlumberger

Technical Paper: Improved Petrology & Petrophysics Characterization of Complex Siliciclastic Reservoirs through Integrated Logs Analysis- Case Study in South China Sea

Society: IPTC
Paper Number: 14558
Presentation Date: 2012
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Abstract

Petrology attributes of reservoir rock are fundamental elements resulting varied petrophysical responses, and controlling reservoir flowing performance. This paper presents a workflow characterizing complex sand-shale sequenced reservoir with a case study in South China Sea. An integrated approach of integrating elemental neutron capature spectroscopy, formation micro-resistivity image and nuclear magnetic resonance (NMR) data are used to characterize reservoir petrology attributes of mineral composition, grain size, sorting and layering fabric; with improved understanding of state dependency problems, such information is of more use in petrophysical evaluation and reservoir producibility simulation. The information can also be integrated into further geological study to improve the certainty of model. Such an integrated approach is proven an effective way to reveal the reservoir intrinsic properties, better to understand interrelationship of sedimentary model, petrology and petrophysics of target formation, and more accurately to delineate reservoir.

The marginal reservoir of the case study presents numerous challenges such as low porosity/low permeability, complex porosity-permeability relationship, high apparent water saturation that may or may not produce water, and thin laminations. Due to the nature of these complexities, different reservoir zones with very similar looking in conventional logs behaved totally different production performance from well testing results. This created difficulties for routine petrophysical analysis which often resulted in under-estimated or overestimated reservoir zones without consistency. By integrating multi logging analysis skills with improved methods to characterize sedimentary petrology & intrinsic petrophysical properties of reservoirs, the approach has been demonstrated as an effective way of well understanding the reservoir and evaluating productivity with significantly improved accuracy. Accurate pay zone characterization gained immediate economic impacts on offshore operation. More importantly, the reservoir knowledge gathered is definitely beneficial for further appraisal and future field development planning.

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