--> Abstract: Causes and Suggested Methods to Exploit Low Productivity Sand — A Case Study from Miocene Tipam Sand of Geleki Field in North Assam Shelf, Assam & Assam-Arakan Basin, India, by Sujit K. Roy Moulik and Harvinder J. Singh; #90078 (2008)

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Causes and Suggested Methods to Exploit Low Productivity Sand — A Case Study from Miocene Tipam Sand of Geleki Field in North Assam Shelf, Assam & Assam-Arakan Basin, India

Sujit K. Roy Moulik and Harvinder J. Singh
Oil and Natural Gas Corporation Limited, KDMIPE, Dehradun, India

The TS-5A sand of Miocene age is one of the major hydrocarbon producers in Geleki Field, situated 50 km from Jorhat of North Assam Shelf, Assam & Assam-Arakan Basin, India. TS-5A sand is quite extensive reservoir which is further subdivided into two sub-units viz., TS-5A1 & TS-5A2 separated by shale layer having thickness in the order of 1 to 10 m. TS-5A2 sand is interpreted as oil bearing from log evaluation but, the yield of hydrocarbon is low, so the reservoir quality is inferred to be poor. The overlying TS-5A1 sand has much better reservoir characteristics and so it is a good producer of oil.The objective of this study is to bring out the plausible reasons for poor production performance and to suggest methods for exploitation of oil from TS-5A2 sand.

Detailed analysis of various core data, logs, and production data along with available geophysical and petro physical data has led to establish the poor permeability (fraction of a millidarcy), as the plausible reason for low productivity of TS-5A2 sand. Diagenetic effects are more pronounced in TS-5A2 than in TS-5A1. Studies also reveal that both TS-5A1 and TS-5A2 are the products of different braided channel systems.

In spite of diagenetic overprint, the quality reservoir sands within TS-5A2 is found to occur broadly along the length of the main channel trending between NE-SW and NNE-SSW.

Production data of the overlying TS-5A1 sand show that TS-5A1 & TS-5A2 sands are hydro dynamically connected. TS-5A2 can be tapped from TS-5A1 and the optimum production can be obtained using proper injection rate at the bottom of TS-5A1. This study will help in planning in a better way to exploit TS-5A2 reservoir sand.

 

AAPG Search and Discovery Article #90078©2008 AAPG Annual Convention, San Antonio, Texas