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Volume 71, No. 2 • 2011 A NEWSLETTER OF THE OKLAHOMA GEOLOGICAL SURVEY The University of Oklahoma MEWBOURNE COLLEGE OF EARTH & ENERGY 71 Mississippian Play Workshop a Sellout! One of the Oklahoma Geological Survey’s primary missions is the dissemination of information necessary to assist operators in the development of the State’s oil and natural gas resources. Towards that end the Survey hosted a workshop dedicated to one of the most actively sought reservoirs in Oklahoma. The Mississippian Play Workshop that was held on May 18th was bittersweet for Survey staff. Although we obviously selected a topic of tremendous interest to our audience, we unfortunately could not begin to accommodate the number of people that wanted to attend this workshop. On the plus side, an audience of approximately 300 was able to attend the workshop, which received excellent reviews for its fresh and varied look at the Mississippian Play. Due to the overwhelming popularity of this workshop, the Survey is offering it again on August 2nd. This has been made possible through the kindness and assistance of Kurt Rottmann, the workshop’s technical coordinator, and several other speakers from the May workshop who graciously committed to present their material for a second time. The Mississippian of northern Oklahoma, often called the Mississippi Lime, has long been an important producing horizon. In some areas, such as the Sooner Trend, which is located on the shelf of the Anadarko Basin in north-central Oklahoma, it has been the primary producing formation since the 1960’s. However, in most other areas it has been regarded as little more than a convenient ‘bail out’ zone for wells that were unproductive in their primary objective. The fact that it was almost always oil-saturated gave it the ability to produce almost anywhere. Unfortunately, its low matrix permeability meant that while it could usually produce enough to pay for the completion, this was rarely suffi cient to pay for an entire well. Usually appearing on well logs as a massive limestone, in places the Mississippian contains zones that are siliceous. The most prolifi c of these cherty intervals, which often have excellent reservoir properties, occurs at the very top of the interval and is usually referred to as the Mississippi Chat. It was this facies that was developed fi rst. The limestone beneath consists of alternating porous and impermeable strata that are often barren. Diffi culties in correlating various facies within the limestone made them appear in an erratic and seemingly random pattern. This lead to a fundamental misunderstanding of the reservoir’s potential, which in turn has lead to bypassed reserves. Operators today, armed with modern horizontal drilling and completion techniques and the benefi t of high crude oil prices, have been able to breathe new life into this reservoir’s development. Horizontal wells are ideally suited to Mississippian reservoirs that are usually Continued on pg. 2 G. Randy Keller, Oklahoma State Geologist and Dan Boyd, OGS Geologist
Object Description
Okla State Agency |
Geological Survey, Oklahoma |
Okla Agency Code | 'GEO' |
Title | Oklahoma geology notes, 2011, v.71 no.2 |
Authors |
Oklahoma Geological Survey. |
Publication Date | 2011 |
Publication type |
Newsletter |
Purpose | Mississippian Play Workshop a Sellout! |
For all issues click | G500.6 G345n |
Digital Format | PDF, Adobe Reader required |
ODL electronic copy | Downloaded from agency website: http://www.ogs.ou.edu/pubsscanned/NOTES/2011Vol71_2.pdf |
Rights and Permissions | This Oklahoma government publication is provided for educational purposes under U.S. copyright law. Other usage requires permission of copyright holders. |
Language | English |
Month/year uploaded | February 2012 |
Date created | 2015-12-10 |
Date modified | 2015-12-10 |
OCLC number | 890217423 |
Description
Title | 2011 v71 no2 Ok geology notes 1 |
Full text | Volume 71, No. 2 • 2011 A NEWSLETTER OF THE OKLAHOMA GEOLOGICAL SURVEY The University of Oklahoma MEWBOURNE COLLEGE OF EARTH & ENERGY 71 Mississippian Play Workshop a Sellout! One of the Oklahoma Geological Survey’s primary missions is the dissemination of information necessary to assist operators in the development of the State’s oil and natural gas resources. Towards that end the Survey hosted a workshop dedicated to one of the most actively sought reservoirs in Oklahoma. The Mississippian Play Workshop that was held on May 18th was bittersweet for Survey staff. Although we obviously selected a topic of tremendous interest to our audience, we unfortunately could not begin to accommodate the number of people that wanted to attend this workshop. On the plus side, an audience of approximately 300 was able to attend the workshop, which received excellent reviews for its fresh and varied look at the Mississippian Play. Due to the overwhelming popularity of this workshop, the Survey is offering it again on August 2nd. This has been made possible through the kindness and assistance of Kurt Rottmann, the workshop’s technical coordinator, and several other speakers from the May workshop who graciously committed to present their material for a second time. The Mississippian of northern Oklahoma, often called the Mississippi Lime, has long been an important producing horizon. In some areas, such as the Sooner Trend, which is located on the shelf of the Anadarko Basin in north-central Oklahoma, it has been the primary producing formation since the 1960’s. However, in most other areas it has been regarded as little more than a convenient ‘bail out’ zone for wells that were unproductive in their primary objective. The fact that it was almost always oil-saturated gave it the ability to produce almost anywhere. Unfortunately, its low matrix permeability meant that while it could usually produce enough to pay for the completion, this was rarely suffi cient to pay for an entire well. Usually appearing on well logs as a massive limestone, in places the Mississippian contains zones that are siliceous. The most prolifi c of these cherty intervals, which often have excellent reservoir properties, occurs at the very top of the interval and is usually referred to as the Mississippi Chat. It was this facies that was developed fi rst. The limestone beneath consists of alternating porous and impermeable strata that are often barren. Diffi culties in correlating various facies within the limestone made them appear in an erratic and seemingly random pattern. This lead to a fundamental misunderstanding of the reservoir’s potential, which in turn has lead to bypassed reserves. Operators today, armed with modern horizontal drilling and completion techniques and the benefi t of high crude oil prices, have been able to breathe new life into this reservoir’s development. Horizontal wells are ideally suited to Mississippian reservoirs that are usually Continued on pg. 2 G. Randy Keller, Oklahoma State Geologist and Dan Boyd, OGS Geologist |
Date created | 2012-02-10 |
Date modified | 2012-02-10 |