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Geology/WATER AQUIFER

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Question
QUESTION: sir how would you look khewra sandstone with respect to geochemistry?we always look into source rock for geochemical test.can we check reservoir rock in this way?if yes then plz give me idea

ANSWER: Muhammad,

Khewra Sandstone is only a reservoir, and there is no need to check its source rock potential. Yes, you can check the source potential of any reservoir rock. Irrespective of the type of rock the geochemical analysis follows the same procedure.

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QUESTION: SIR IF WE HAVE TO DRILL 2000M AND WE ENCOUNTER A WATER AQUIFER AT 1500M?WHAT WILL BE THE POSSIBLE WAY TO ACHIEVE THE TARGET?

Answer
Muhammad,

At that depth it is most likely to be an artesian aquifer. Subject to how high is the pressure, the mud-weight has to be designed. You may either continue with an overbalanced mud if the pressure is not high, and the rock strength of the deeper section is not at a risk for another 500 m. But the mud-weight would have to be monitored closely because of the mixing of the water from the aquifer. Sometimes in such a case when the returns from the annulus are not significant the drilling is conducted with an underbalanced mud. This is a typical problem in Adhi field, and while drilling the Murree formation in general. We used to continue the drilling with an underbalanced mud as long as the returns from the annulus were manageable.

Otherwise the aquifer has to be isolated/cased before the deeper drilling is undertaken.  

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Nusrat Kamal Siddiqui (Mr)

Expertise

I am a petroleum exploration geologist with about 40+ years of diversified experience. I can answer questions on stratigraphy, log interpretation, field studies based on set of logs and core results, general geology etc. Can provide guidance for career planning in earth sciences. Can not help in questions about hard rocks, igneous petrology & mineralogy, sequence stratigraphy and seismic.

Experience

Petroleum Exploration - field geology, stratigraphy, prospect generation, interpretation of satellite imagery (visual), log interpretation.

Organizations
Retired in May, 2006 as Senior Manager Exploration from Pakistan Petroleum Limited after serving 26 years. Since then continuing in active service with petroleum exploration companies.A cumulative experience of about 40 years covers 30 years in petroleum exploration, 5 years hydrogeology experience in Libya, and about 5 years of dam geology in Pakistan.

Publications
-AAPG Bulletin (Vol.88, July, 2004); paper on Sui Main Limestone (Eocene), a prolific gas reservoir in Pakistan. -Have presented papers on diversified topics ranging from spirituality, flood control, remote sensing and off course geology in France, Nepal, Bangladesh, Sri Lanka, UAE, Kashmir, India and Pakistan that have been published in respective Special Proceedings. -ONGC Bulletin(India) Vol. 44, Number 2, December, 2009; Chapter 19.A & 19.B on basin architecture and stratigraphy of Pakistan, p.402-474.

Education/Credentials
BSc Honours in Geology and Master of Science in Petroleum and Structural Geology. PGD from ITC, The Netherlands.

Awards and Honors
-Remained Active Member of AAPG from 1990-2006; founding member of PAPG (a local affiliate of AAPG). -Life member of SEGMITE & AGID, and Senior Editor of SEGMITE magazine. -Member of the Board of Studies, i. Department of Petroleum & Gas Engineering (BUITMS, Quetta), and ii. Geology Department, Sindh University, Jamshoro. -Member of Stratigraphic Committee of Pakistan. -Represented Mining Journal, UK in Pakistan till 2007. -Chairman of Annual Technical Conference (ATC)& Oil Show, an SPE/PAPG annual event, in 2003. -Chairman Technical Committee (ATC, 2002).

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