Kim E. Drew

CONSULTING GEOLOGIST

TULSA. OK 74152

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DOODLE PROSPECT

 

The Doodle Prospect is a virgin Wilcox Sand structure play with up hole potential in the Cleveland, Skinner, Red Fork, Bartlesville, and Gilcrease sands.  The prospect is located in East Creek County, Oklahoma. The Doodle prospect is literally surrounded by very good current production from six different producing horizons.

Overall this area is in the Northern end of the Seminole uplift where it abuts the Cherokee Platform. This area is the flexure point that created an abundance of small structural anomalies that form the many Wilcox Sand oil fields. This area of Creek County also has good oil and gas production from an additional half a dozen formations ranging from 600 to 4000 feet deep.

The primary target of this prospect is the Wilcox sandstone. The Wilcox is an Ordovician age blanket type deposit that covers this area and ranges from a dozen feet to over 80 feet in thickness. The sand only produces where it is found in structural dome type traps. Wilcox fields can be found in small tight or broad gentle structures that cover 30 to 350 acres in extent. Even a small 40 acre field can hold as much as 1 million barrels of producible oil. An example of a small tight field is the Eastok Morgan field in Section 9 T12N R11E. This 60 acre field has produced over 1.2 million barrels of oil to date from a 30 foot structure. An example of a broad feature would be the field to the southeast in Section 32 T14N R10E. This 300 acre field has been estimated to have produced over 2.3 million barrels of oil to date.

 My mapping shows a clear structural high centered over the southwest quarter of section 17. (see Wilcox structure map). When prospecting for a Wilcox structure it is always nice to have a “show well” that we can move up dip from. In this prospect the show well is the Producers Pipe and Supply Moore # 1 well drilled in 1945. This well is located in the NE SE NW of section 17. The well reported the top of the Wilcox sand at 3636’ with oil shows in the sand and free oil seen from 3641 to 3643. The first note of saltwater was at 3650 with a note of HFW at 3662 to 3671. What this shows us is that live movable oil is located in this well and that it has a possible oil column of 8 feet. Now our objective is to get up structure from this show well. I believe that the first proposed well site will be 15 to 25 feet up structure giving us a 23 to 33 foot oil column (See Down dip Wilcox Top Map). If this is confirmed by drilling then producible reserves of 750,000 barrels can be calculated on this prospect. Also of significance is the fact that several Wilcox fields are in line and on strike with this prospect. The closest is a five well field drilled starting in 1941 centered over the southwest quarter of Section 20. This field started producing before accurate production records were kept. However the reported modern cumulative production is over 199,916 barrels of oil.

A well drilled by EDH Operating in 1986 (NW SE SE 18) called a Wilcox top at 2800’. There is a discrepancy with the TD indicated on the completion report being to shallow to have reached the Wilcox. I cannot locate logs, or positive information on this well. The plugging report, and drilling contractor indicate a TD in the Gilcrease. I have created two Wilcox structure maps one with the EDH point and one without it. Both show a significant Wilcox structure under this prospect.

Of secondary importance in this area is the Bartlesville sandstone. The Bartlesville can be a wildly prolific producer where found on a structure trap. The giant Glenpool field is an example of a Bartlesville field. This middle Pennsylvanian age sand blankets the prospect area with over 120 feet of sand. (see Bartlesville sand isopach) Recent drilling activity has been targeting the Bartlesville sand and good production has been established literally surrounding this prospect. In fact the quarter section to the west of the Doodle Prospect has produced over 198,500 barrels of oil and 580 million cubic feet of gas since 1990 from 3 Bartlesville wells and one Skinner well. A structure map based on the top of the Bartlesville sand shows a nice structure centered over this prospect. (see Bartlesville structure map)

Also of importance is the Gilcrease sandstone. This sand represents an off-shore bar type deposit consisting of laminated sand, shale, and limes. It is generally a stratigraphically trapped reservoir that is found all around this area. Some of these wells can be very prolific producers. Although hard to map over a large area where found over lapping or lapping up against a Wilcox high these zones can be excellent producers with from zero, to five or six separate sand bodies in the section.  The famous Slick field just to the north of this prospect is an excellent example of a large Gilcrease field. Several Gilcrease producers or old dry holes with oil and gas shows are present all around this prospect.

Also of interest are the Cleveland, Skinner and Red Fork sands. These middle Pennsylvanian age rocks are all productive in good fields within a few miles of this prospect. In fact the Red Fork sand is trending east and west across this prospect and looks to be a key backup target in the Doodle Prospect. A structure map on the Pink Lime is a good shallow indicator of structure. In this case the map shows a high over the Doodle Prospect (see Pink Lime structure) Several Red Fork wells in the west half of the northeast quarter of section 18 had initial production rates of 2 barrels of oil with 150,000 cubic feet of gas to 416 barrels of oil per day. These 5 wells have produced over 70,000 barrels of oil since 1985.

This prospect was pin pointed after a regional study was done covering 3 Townships or approximately 108 square miles. Each well in the area was examined and if it penetrated the Wilcox sand then a subsea top was assigned if possible. Regional maps were then created to follow trends and find small previously missed structures. Twenty years ago an old seismic company explorationist told me to look for highs in the center of sections because all the highs that cross county roads have been found. This is because years ago companies could easily run seismic lines up and down county line roads. Laws since the 60’s have made it much more difficult to run seismic lines in northeast Oklahoma. In fact in my 25 years of prospecting I have found several highs but all have fallen in the center of sections away from roads. The Doodle Prospect falls into this same scenario as the high is centered in the southwest quarter of Section 17.

The possibility also exists for big deeper production in the Tyner, McLish, and  Oil Creek sandstones, as well as the Arbuckle lime formations. These formations are present in this area but have been woefully under explored. The lower Ordovician McLish and Oil Creek sands are porous blanket sands that must be found in structural traps. There appears to be a real correlation between the Wilcox structure and deeper structures. The lower Ordovician upper Cambrian Arbuckle is a massive limestone, and dolomite complex that can be productive in both structural features, as well as in stratigraphic traps caused by dolomitization, or localized porosity. Only one well was drilled deep enough to test these formations in this area. Further study and drilling should be done to explore these prolific deeper horizons.

In conclusion the Doodle Prospect is exciting in that we have tantalizing shows of oil in the Wilcox sand all around the prospect. Regional work shows a high in a nice line with Wilcox fields to the north and south of the lease. Furthermore the Bartlesville, Red Fork, Gilcrease and Skinner sands appear to be present and have all proven to be productive within a stone’s throw of this prospect. I truly feel that this prospect has the thrill and potential of finding a new virgin Wilcox field.

 

Respectfully Submitted

Kim Drew

Doodle Prospect Participation Agreement

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