Study on the Characteristics of Oil Pay Zone in the Brushy Canyon Formation,  Delaware Mountain Group of the Delaware Basin

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doi:10.32390/ksmer.2021.58.2.179

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2021 Vol.58, Issue 2 Preview Page Next Page

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Study on the Characteristics of Oil Pay Zone in the Brushy Canyon Formation, Delaware Mountain Group of the Delaware Basin 델라웨어분지 내 델라웨어마운틴층군 브러쉬캐년층의 오일 생산구간 특성 연구

30 April 2021. pp. 179-190

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Abstract

The Delaware Basin is a Paleozoic sedimentary basin that contains approximately 4 km thick deposits located in western Texas and southern New Mexico, USA. The Delaware Mountain Group is distributed at about 1.22–2.44 km depths. The Brushy Canyon Formation of the Delaware Mountain Group comprises cyclic interbeds of siliciclastics and carbonates deposited by deep-sea turbidity currents. The reservoirs are developed in the channel-levee-lobe complex, where sandstone deposits in the channel are sealed by organic-rich siltstones, forming highly oil-productive intervals distributed at relatively shallow depths. The oil-productive zone of Roadrunner #2 is located at 2,257–2,282 m in depth, with a gamma-ray range of 57–88 API, inferred as the channel depositional facies because of small variations in gamma-ray values. The density ranges 2.1–2.6 g/cm³, while neutron porosity is 9.6–25.4%. Careful evaluation of the geophysical characteristics of the pay zone will help define targets when planning new drilling in the study interval.

Keywords

Permian Basin

Delaware Basin

Delaware Mountain Group

델라웨어분지는 고생대 페름기 퇴적분지인 퍼미안분지의 서브분지로서, 미국 텍사스 서부와 뉴멕시코 남부에 약 4 km 두께의 퇴적층이 분포하며, 이중 델라웨어마운틴층군은 지표하 약 1.22~2.44 km 심도에 분포한다. 델라웨어마운틴층군 중 브러쉬캐년층은 심해 저탁류 기원의 규산쇄설암과 탄산염암의 교호층으로 이루어져 있으며, 저류층은 채널-제방-로브퇴적 복합체 중 채널의 사암체를 유기물이 풍부한 실트암이 덮고 있어 상대적으로 얕은 심도에 생산성이 좋은 오일이 분포하고 있다. 연구 결과 생산정 Roadrunner #2의 오일 생산구간은 심도 2,257~2,282 m에 위치하며, 감마선값이 57~88API의 작은 범위에서 변화하는 것으로 보아 채널 환경 퇴적상으로 유추된다. 밀도는 2.1~2.6 g/cm³로 측정되었고 중성자 공극률은 9.6~25.4%로 대체로 높게 측정되었다. 이러한 오일 생산구간의 물리적 특성은 향후 델라웨어마운틴층군에 새로운 시추를 계획할 때 타겟 구간 선정에 도움을 줄 수 있을 것이다.

키워드

퍼미안분지

델라웨어분지

델라웨어마운틴층군

브러쉬캐년층

생산구간

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Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 58
No :2
Pages :179-190
Received Date : 2021-01-20
Revised Date : 2021-04-07
Accepted Date : 2021-04-27
DOI :https://doi.org/10.32390/ksmer.2021.58.2.179

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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