ABSTRACT

Catahoula Creek Field, one of Mississippi's most significant discoveries, is located in Hancock and Pearl River Counties approximately fourteen (14) miles northwest of Bay St. Lous. The field was discovered in August 1981, with the successful completion and testing of the No. 1 Rhoda Lee Brown, Section 28, T6S-R15W by Hunt Energy Corporation/Saga Petroleum et al. Stabilized flow rates of 10-13 MMCFGPD were encountered with FTP of 9100-9250# through 28/64" choke from Cotton Valley sands at a depth of 19, 816'-20,038'. A total of 114'net sand was perforated and acidized. Two additional field wells have been drilled, a western offset in Section 29, T6S-R15W, a southern offset in Section 33, T6S-R15W and are awaiting completion. A northern offset in Section 18, T6S-R15W is presently being drilled and further development is planned.

The Catahoula Creek Cotton Valley sands are presently not definable by seismic methods, therefore structural interpretation is based on the upper Smackover/Haynesville carbonate reflection approximately 950 below the top of Cotton Valley sand complex or the middle Cotton Valley carbonate reflection approximately 1000'above the pay zones. The Catahoula Creek field is underlain by a high relief (900'-1000') NW/SE trending salt-created closed structure at the upper Smackover/Haynesville carbonate level bounded by major and minor down-to-the-coast faults.

The structure at the middle Cotton Valley carbonate level is almost flat and only the major faults seem to carry through up to this level, indicating Upper Jurassic time of structural growth.

The Cotton Valley gas sands (Kimmeridgian) in the Catahoula Creek Field were deposited in a shelf environment and can be numbered according to porosity zones from one (1) through eleven (11). At this stage in the development only one (1) through seven (7) have been perforated, but there is indications of hydrocarbons in all zones.

The reservoir rock exhibits matrix porosity of 4 to 18% directly related to mineralogy, lithology and diagenetic history. Matrix permeability is low .3>K>.01 md or less but intense vertical fracturing is eminent and fracture permeability has been measured in the range of 1 to 4.3 md, explaining the high flowrates while testing.

Figure 1. INDEX MAP

FIGURE 2. [Grey Scale] FDC - CNL LOG

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