SHAKER, SELIM S., Phillips Petroleum Co., Houston, TX

ABSTRACT: Geologic Models in Relation to Spillpoints Position, Gulf of Mexico

Study of the production figures from different faulted blocks in one of the large producing fields in the Gulf of Mexico has established the linkage between the geological trapping models to their potential reserves. In a water drive system, defining the type and position of the spill point within the prospective closure in relation to the surrounding segments is vital for assigning any potential reserves.

Six main fault trap models were assigned to the subject field. The amount and direction of fault throw in relation to the structural relief determine the juxtaposing lithology on both sides of the fault plane. Thickness and lithosequence of the objective section dictate the hydrocarbon's column height within the trap.

In descending order, according to the models' production size, they are A to F. A and B models, only three segments, yielded about 60% (266 billion cubic feet of gas) of the total reserves; meanwhile, C and D models (12 structural closures) produced 40% of the total reserves. On the other hand, models E and F were tested wet even at the structurally highest crests.

Study of production in the outer shelf-slope environment sediments in the Gulf of Mexico show many occurrences where these models are applicable. By applying this proper trapping model on a prospect, both Exploration's and Development's risk can be reduced.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.