skip to main content

Title: The role of diagenetic studies in flow-unit modeling: San Andres formation, Yoakum County, Texas

The Permian San Andres Formation represents one of the most prolific hydrocarbon-producing intervals of the Permian basin. Dolostone lithofacies intercalated with thin evaporites accommodate highly compartmentalized reservoirs resulting from complex depositional and diagenetic histories. This compartmentalization often facilitates the use of these reservoirs in flow-unit studies. Perhaps more important than the relationship of productive intervals to depositional facies is the degree to which diagenetic processes have influenced reservoir properties. Detailed petrographic evaluation of the reservoir in question, though often overlooked, should be an integral part of flow-unit studies. Once a diagenetic sequence is established, the information may be incorporated in to the facies model to better understand how to subdivide the reservoir. Such an investigation has been conducted on the San Andres Formation in Reeves field of southeastern Yoakum County, Texas. Here, multistage diagenetic overprints are superimposed on depositional facies that vary in degree of lateral extent, thereby complicating the geometries of individual productive zones within the reservoir. Analysis of the reservoir reveals that Reeves San Andres sediments were subjected to dominant diagenetic processes, including dolomitization and sulfate implacement, both of which are major factors in porosity preservation, and a variety of minor processes that have had little effect onmore » reservoir quality. The recognition of diagenetic facies, and understanding of the processes that have created them, and identification of the implications of these processes on reservoir properties is a vital part of any flow-unit study.« less
Authors:
 [1]
  1. (Texas Tech Univ., Lubbock, TX (United States))
Publication Date:
OSTI Identifier:
6944276
Report Number(s):
CONF-9404148--
Journal ID: ISSN 0149-1423; CODEN: AABUD2
Resource Type:
Conference
Resource Relation:
Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States); Journal Volume: 78:3; Conference: American Association of Petroleum Geologists (AAPG) Southwest Section meeting, Ruidoso, NM (United States), 24-26 Apr 1994
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; FLUID FLOW; GEOLOGIC MODELS; OIL FIELDS; PRODUCTIVITY; RESERVOIR ROCK; DEPOSITION; PHYSICAL PROPERTIES; SEDIMENTS; DIAGENESIS; TEXAS; EVALUATION; EVAPORITES; HYDROCARBONS; PERMIAN BASIN; POROSITY; SEDIMENTARY BASINS; ZONES; DEVELOPED COUNTRIES; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; MINERAL RESOURCES; NORTH AMERICA; ORGANIC COMPOUNDS; PETROLEUM DEPOSITS; RESOURCES; ROCKS; SEDIMENTARY ROCKS; USA 020200* -- Petroleum-- Reserves, Geology, & Exploration