2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM

Paper No. 1
Presentation Time: 8:05 AM

Petrography and Biostratigraphy of #101 Las Cañas and Mesita #1 cores, Golden Lane/Poza Rica Trend, Mexico

KRUTAK, Paul R., P. Krutak Geoservices Intl, PO Box 369, Rye, CO 81069-0369, pkrutakgeos@hotmail.com

Petrographic analysis of two cores (Cañas #101 and Mesita #1) from the Golden Lane (Faja del Oro)/Poza Rica oil fields (Cañas and Mesa Cerrada) along the Tuxpan Platform, Mexico reveals that Lower/Middle Cretaceous reefs developed along the margin of the Platform at this time. One facies in this complex (the El Abra Limestones) contains abundant rudists, corals, and benthic/planktic foraminfers. This facies has yielded huge volumes of hydrocarbons. For example, the Potrero del Llano #4, blew out in December, 1910 at a rate exceeding 100,000 BO/day. It produced 93 million BO, and is possibly the most productive well ever drilled. Thin sections cut from the #101 Cañas cores (Cores 1-4; 6-7; 9-11; 13-17) demonstrate the following petrographic trends: #1; foraminiferal mudstone with sparite-filled fractures; #2; angular quartz in foraminiferal mudstone; #3; chert overlain by foraminiferal ooze; #4; Cuneolina sp. and Miliolidae; #6; Barkerina barkerensis (Albian); #7, Dictyoconus sp. with gastropods and spar cement; # 9; bitumen with dogtooth spar and bryozoa; #10; bryozoans with moldic porosity; #11; pelletoidal boundstone with limestone clasts and rim cement; #13; corals and meniscus cement in interparticle porosity; #14; oolitic grainstone with oil stains along stylolites; #15; rudists in oil shale with metamorphic quartz clasts; #16; lithic arenite with hematite cement; and #17; subarkose with granite fragments and angular quartz. The other core (Mesita #1-Cores 2, 4 and 5) exhibits these variations: #2; Cuneolina sp. with spar cement; #4; orbulinid foraminifers and rudists; and #5; Dictyoconus sp. with spar cement. The thin sections from the #101 Las Cañas and Mesita #1 cores allow insight into a portion of the giant Pimienta-Tamabra (!) petroleum system in the Tampico/Misantla Basin, Mexico. The total reserves of this system are ~ 66.3 BBO and 103.7 TCF of natural gas. This is ~ 836 BBOE.
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