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Title: Carbonate lithofacies, diagenesis, porosity relationships and crude oil geochemistry, Ratawi Formation, Kuwait-Saudi Arabia divided neutral zone

Abstract

The Neocomian Ratawi Formation, in Kuwait-Saudia Arabia Divided Neutral Zone, is divided into six lithologic facies: algal wackestone (Ia), skeletal wackestone/packstone (Ib), algal boundstone (IIa), biopelpackstone/grainstone (IIb), oobiopelgrainstone (IIc), and planktonic-fossil assemblage indicate a shallow, open normal marine environment. Intermicrite porosity is the dominant porosity in Wafra, Hout and Dorra fields (70-90% of the total 20%) while biomoldic porosity is dominant in Khafji area. The Wafra limestone is interrupted by a long interval of clay invasion which deposited shale/limestone intercalation in the subtidal environment. The total thickness of the boundstone facies ranges from 50-100 feet in Wafra and Khafji to 20 feet in Dorra. The oil was accumulated in three major types of voids; intergranular, biomoldic, and interframe porosities. The biopelpackstone/grainstone (IIb) facies occurs as thick beds in Wafra and Khafji limestones and decreases abruptly in the Hout and Dorra areas. This facies indicates a subtidal/shelf edge depositional environment. This facies exhibits the highest effective porosity (up to 30%), where the dominant biomoldic and intergranular porosities are filled partially with dead oil. The oobiopelgrainstone was confirmed only in the Wafra area where it reaches a thickness of 150 feet. It is composed mainly of coated bioclastic fragments, which indicate anmore » outer shelf depositional environment. The porosity is predominantly intergranular (12-18%) and is filled with oil.« less

Authors:
Publication Date:
Research Org.:
Texas Tech Univ., Lubbock, TX (USA)
OSTI Identifier:
7017931
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; KUWAIT; PETROLEUM DEPOSITS; GEOLOGY; SAUDI ARABIA; ALGAE; CLAYS; DEPOSITION; DIAGENESIS; GEOCHEMISTRY; GEOLOGIC HISTORY; GEOLOGIC STRUCTURES; GEOLOGIC TRAPS; LIMESTONE; LITHOLOGY; OIL SATURATION; PETROLEUM; POROSITY; RESERVOIR ROCK; SEDIMENTATION; SHALES; THICKNESS; ASIA; CARBONATE ROCKS; CHEMISTRY; DIMENSIONS; ENERGY SOURCES; FOSSIL FUELS; FUELS; GEOLOGIC DEPOSITS; MIDDLE EAST; MINERAL RESOURCES; PLANTS; RESOURCES; ROCKS; SATURATION; SEDIMENTARY ROCKS; 020200* - Petroleum- Reserves, Geology, & Exploration

Citation Formats

Albehbehani, A S.K. Carbonate lithofacies, diagenesis, porosity relationships and crude oil geochemistry, Ratawi Formation, Kuwait-Saudi Arabia divided neutral zone. United States: N. p., 1988. Web.
Albehbehani, A S.K. Carbonate lithofacies, diagenesis, porosity relationships and crude oil geochemistry, Ratawi Formation, Kuwait-Saudi Arabia divided neutral zone. United States.
Albehbehani, A S.K. 1988. "Carbonate lithofacies, diagenesis, porosity relationships and crude oil geochemistry, Ratawi Formation, Kuwait-Saudi Arabia divided neutral zone". United States.
@article{osti_7017931,
title = {Carbonate lithofacies, diagenesis, porosity relationships and crude oil geochemistry, Ratawi Formation, Kuwait-Saudi Arabia divided neutral zone},
author = {Albehbehani, A S.K.},
abstractNote = {The Neocomian Ratawi Formation, in Kuwait-Saudia Arabia Divided Neutral Zone, is divided into six lithologic facies: algal wackestone (Ia), skeletal wackestone/packstone (Ib), algal boundstone (IIa), biopelpackstone/grainstone (IIb), oobiopelgrainstone (IIc), and planktonic-fossil assemblage indicate a shallow, open normal marine environment. Intermicrite porosity is the dominant porosity in Wafra, Hout and Dorra fields (70-90% of the total 20%) while biomoldic porosity is dominant in Khafji area. The Wafra limestone is interrupted by a long interval of clay invasion which deposited shale/limestone intercalation in the subtidal environment. The total thickness of the boundstone facies ranges from 50-100 feet in Wafra and Khafji to 20 feet in Dorra. The oil was accumulated in three major types of voids; intergranular, biomoldic, and interframe porosities. The biopelpackstone/grainstone (IIb) facies occurs as thick beds in Wafra and Khafji limestones and decreases abruptly in the Hout and Dorra areas. This facies indicates a subtidal/shelf edge depositional environment. This facies exhibits the highest effective porosity (up to 30%), where the dominant biomoldic and intergranular porosities are filled partially with dead oil. The oobiopelgrainstone was confirmed only in the Wafra area where it reaches a thickness of 150 feet. It is composed mainly of coated bioclastic fragments, which indicate an outer shelf depositional environment. The porosity is predominantly intergranular (12-18%) and is filled with oil.},
doi = {},
url = {https://www.osti.gov/biblio/7017931}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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