渤海湾盆地歧口凹陷古近系沙一下亚段中等成熟页岩油富集主控因素与勘探突破

doi:10.11743/ogg20220506

Abstract

Abstract:

Continental lacustrine basins are rich in shale oil resources of medium maturity， which features rapid lithofacies change， low diagenetic evolution， strong reservoir sensitivity， and high crude oil viscosity. Engineering development strategies in this regard are thereby still in the exploratory stage. The typical lacustrine source rocks of medium maturity in the lower sub-member of the first member of the Paleogene Shahejie Formation （E₃s^1L） at the southwestern margin of Qikou Sag， Bohai Bay Basin are analyzed to discover the major control factors of medium-mature shale oil enrichment and engineering countermeasures to them， and explore the development and production plan of medium-maturity shale oil. The research shows that the clay mineral content in the dolomitic limy shale intercalated by thin-bedded carbonate rocks is less than 30 %， and the anti-swelling fracturing fluid system of seawater-based slickwater can inhibit the sensitivity of such reservoirs and solve the problem of formation collapse caused by the water swelling of clay minerals； Factors including reservoir brittleness， hydrocarbon generation condition， oil content and reservoir water sensitivity are the key in controlling the distribution of medium-maturity shale oil sweet spots， and the thickness of these sweet spots generally ranges between 10 m and 12 m. Application of pre-stack migration data volumes to carry out reservoir prediction， accurately reading the depth of the landing point， accurately steering rotary drilling， accurately keeping lateral within the sweet spot interval， and improving the drilling encounter rate of sweet spots， all are the prerequisites for gaining high and stable production； and swelling resistance with seawater-based fracturing fluid， volume fracturing with energy accumulated at the toe end， and energy enhancement and viscosity reduction with CO₂ as pad fluid， can help realize production enhancement by fracturing. These new understandings have been applied to optimize the completion of Well QY1H， resulting in a total production of 7 303.28 tonnes of oil in 437 days （a daily output of 16.75 tonnes on average）， which marks a breakthrough made in the exploration of the medium-maturity shale oil.

Key words: reservoir sensitivity, sweet spot evaluation, shale oil of medium maturity, lower sub-member of the first member of Shahejie Formation （E₃s^1L）, Qikou Sag, Bohai Bay Basin

CLC Number:

TE122.2

Lihong Zhou, Haiqing He, Xujie Guo, Changwei Chen, Guomeng Han, Fei Yang, Jianying Ma, Suyan Zhou. Main factors controlling the medium-mature shale oil enrichment and exploration breakthrough in the Paleogene lower E₃s^1L in Qikou Sag， Bohai Bay Basin[J]. Oil & Gas Geology, 2022, 43(5): 1073-1086.

Figures/Tables 10

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Main factors controlling the medium-mature shale oil enrichment and exploration breakthrough in the Paleogene lower E₃s^1L in Qikou Sag， Bohai Bay Basin

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