A method for evaluating the formation and enrichment of continental mud shale oil in large freshwater lake basins

An evaluation method and mud shale technology, which can be applied in soil material testing, instruments, material inspection products, etc., can solve problems such as formation and enrichment of continental mud shale oil in large freshwater lake basins.

CN111694068BActive Publication Date: 2022-05-31PETROCHINA CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-05-31

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Abstract

The invention discloses a method for evaluating the formation and enrichment of terrestrial mud shale oil in a large freshwater lake basin. The method utilizes mud shale oil exploration drilling and coring, accurate description of lithology and lithofacies, and supporting analysis of geological experiments. The formation and enrichment evaluation of facies shale oil, using depth, Ro, diagenetic stage, kerogen, free oil, etc., total porosity, organic and inorganic Rock oil evolution model and other parameter indicators, establish the formation and evolution model of continental shale oil, reservoir pore formation and evolution model, reservoir evolution history and generation evolution history matching relationship, and determine for the first time that the Ro1.1 %-1.6% stage is a favorable window for the formation of shale oil and secondary pore development zone, and the high coupling in time and space creates the necessary conditions for the large-scale accumulation of shale oil, guiding the development of continental shale oil in the Songliao Basin. "Sweet spot" optimization and exploration breakthrough, the lower limit of favorable exploration depth has been extended to 2600m, and the area of ​​sweet spot has been increased from 5800km 2 Extended to 13000km 2 .
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Description

A method for evaluating the formation and enrichment of continental shale oil in large freshwater lake basins technical field The present invention relates to oil field unconventional oil and gas exploration technical field, relate in particular to a kind of large-scale freshwater lake basin continental mud sheet Rock oil formation and enrichment evaluation method. Background technique The breakthrough of shale oil in North America has brought a new round of technological revolution in the global oil and gas industry. The Ordos, Bohai Bay, Nanxiang, and Junggar Basins have achieved industrial oil flow and positive progress in many wells, demonstrating shale oil Good prospects for exploration and development. The research on the formation and enrichment evaluation of shale oil is to solve the optimal period of shale oil formation, the existence of The problem of favorable reservoir space and its time-space matching and enrichment is an important basis for guiding sha...

Examples

Embodiment 1

[0085]

[0086]

[0089] Using the full-scale field emission electron microscopy analysis technology of the micro-nano pore structure of the mud shale oil reservoir, the mud of the Qingshankou Formation was analyzed.

[0090] Laminated shale facies: uneven distribution of pores (Fig. 3), and the pore type is dominated by intergranular pores (61%), reflecting the sedimentary pattern.

[0093] Mesoclastic limestone facies: mostly distributed in thin layers in the shale strata, the pore type mainly develops mesoclastic body cavity pores, and a small amount of [0093]

[0098] Mineral composition and content play an important role in controlling the pores and physical properties of shale reservoirs. Qing 1st shale

[0100]

[0101] (2) Lithofacies type has an important influence on the storage space and physical properties of shale oil reservoirs

[0102] The Qingshankou Formation mainly develops 5 kinds of lithofacies: laminar shale, oil shale, siltstone, mesoclastic limestone, and mi...