About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 46 (1996), Pages 367-372

Integrated Gravity Modeling of Previous HitSaltNext Hit Feature in the Mississippi Previous HitSaltNext Hit Basin

Rhonda L. Schenk (1), John J. Morris (2), Stuart A. Hall (3)

ABSTRACT

Recent exploration in portions of the Mississippi Previous HitSaltNext Hit Basin indicates that some models used in the interpretation of surface and subsurface data may be inadequate to explain several Previous HitsaltNext Hit features. Models are important in interpretation due to the depth of the objectives and the complexity of the Previous HitsaltNext Hit ridges. Significant oil and gas reserves trapped by the Previous HitsaltNext Hit and related faults in Upper Jurassic reservoirs were discovered from the late 1960's to the early 1980's. Early models show concordant overburden on the Previous HitflanksNext Hit of a simple, symmetrical Previous HitsaltNext Hit anticline. However, in the course of further drilling, Upper Jurassic formations and the underlying Previous HitsaltNext Hit were not encountered where predicted by the anticlinal model suggesting that many of the Previous HitsaltNext Hit ridges in the basin are more complex. Well log data indicate that the Previous HitflanksNext Hit of such Previous HitsaltNext Hit features may dip at rates greater than that proposed by the symmetrical anticline model.

A study utilizing an integrated approach to test the viability of a more complex Previous HitsaltNext Hit ridge model was conducted to aid in the interpretation of surface and subsurface data in the Mississippi Previous HitSaltNext Hit Basin. Gravity data in conjunction with seismic reflection data and well log information form the data base from which Previous HitsaltNext Hit models were created. Seismic reflection data and well control provide a reasonable estimate of the depth of the sources of the gravity anomalies. The gravity data, on the other hand, have been used to help constrain the interpretation of the seismic data by providing a better geometric framework for the Previous HitsaltNext Hit bodies observed on the seismic data.

Eucutta Field and Diamond Field were selected as test areas for the Previous HitsaltNext Hit models based on the availability of data. The two fields are located along different types of parallel Previous HitsaltNext Hit ridges. Eucutta is located deeper in the basin in an area of large Previous HitsaltNext Hit features while Diamond is located closer to the rim of the basin where smaller Previous HitsaltNext Hit features are more common.

Results of the study indicate that an asymmetrical pattern exists in which the Previous HitflanksNext Hit of the ridges may dip at different rates. Both the Eucutta and Diamond Previous HitsaltNext Hit ridges exhibit a steeply dipping flank on the basinward side of the Previous HitsaltNext Hit ridge and a more gently dipping landward flank. The Previous HitsaltNext Hit ridges also appear to have a complex along strike variation in the structure of the Previous HitsaltNext Hit. The variations of the Previous HitsaltTop features in both the strike and dip directions appear to reflect the variations in the way the overlying sediments were deposited.


Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Watermarked PDF Document: $14
Open PDF Document: $24