鄂尔多斯盆地南部长探1井上古生界勘探突破及意义

doi:10.3969/j.issn.1672-7703.2021.03.006

摘要/Abstract

摘要： 鄂尔多斯盆地西南缘彬长区块构造特征相对复杂，2020年中国石化在该区块部署的风险探井长探1井在上古生界上石盒子组试获工业气流，标志着盆地南缘上古生界天然气取得新层系突破，随后又有多口井在上石盒子组、下石盒子组、山西组多层试获工业气流或钻遇良好显示，表明盆地南部物源体系中构造复杂带与盆地内部陇东地区不同，上古生界呈现出多层含气。为查明盆地南缘上古生界天然气成藏模式，完善和丰富盆地南部上古生界物源体系成藏认识，通过岩性录井及地层测试、色谱—质谱分析、测井解释、地震解释及属性分析、区域地质类比等技术手段，系统开展了盆地南部彬长区块构造演化及断裂活动、上古生界煤系烃源岩特征、沉积相及储层分布、区域保存条件及天然气输导特征等成藏条件研究。研究结果表明，盆地南部上古生界具备天然气富集成藏的有利地质条件，天然气成藏表现为“多层叠置、断裂输导、下生上储、立体成藏”模式，优质储层分布及高角度断层输导两个关键因素共同决定了盆地南缘天然气富集；大型三角洲砂体厚度大、物性较好，高角度断层输导成藏的区域是下步有利的天然气勘探方向。

关键词: 成藏模式, 上古生界, 南部物源区, 鄂尔多斯盆地

Abstract: Binchang Block in the southwestern margin of Ordos Basin is with complex structural features, In 2020, Well Changtan 1, a risk exploration well drilled by Sinopec, tested commercial gas flow in the Upper Shihezi Formation, marking the natural gas breakthrough in Upper Paleozoic in the southern margin of Ordos Basin. Subsequently, several wells tested commercial gas flow or penetrated good gas shows in Upper Shihezi Formation, Lower Shihezi Formation and Shanxi Formation, showing multiple gas bearing layers of Upper Paleozoic in the complex structural zone of southern basin, which is different from the Longdong area inside basin. In order to find out gas accumulation pattern and improve understanding of the provenance system in the southern margin of the basin, in this paper, the gas accumulation conditions of Upper Paleozoic in Binchang block were systematically studied, including the regional tectonic evolution, fault activities, characteristics of coal measures source rocks, sedimentary facies, reservoir distribution, regional preservation conditions, and natural gas transportation characteristics by means of lithologic logging, formation test, chromatography-mass spectrometry analysis, logging interpretation, seismic interpretation and attribute analysis, and regional geological analogy, etc. The study results show that there are favorable geological conditions for natural gas accumulation of Upper Paleozoic in the southern basin, which is characterized by “multi-layer superposition, fault transportation, lower generation and upper storage, and stereoscopic gas accumulation”. The gas enrichment is jointly determined by the distribution of high-quality reservoirs and high angle fault transportation. The areas where large-scale delta sand bodies are developed with large thickness and good physical properties, as well as high angle faults for gas migration and accumulation are favorable targets for gas exploration.

Key words: gas accumulation pattern, Upper Paleozoic, southern provenance area, Ordos Basin

中图分类号:

TE122.11

齐荣, 何发岐, 王付斌, 贾会冲, 王巍. 鄂尔多斯盆地南部长探1井上古生界勘探突破及意义[J]. 中国石油勘探, 2021, 26(3): 68-78.

Qi Rong, He Faqi, Wang Fubin, Jia Huichong, Wang Wei. Exploration breakthrough of Upper Paleozoic of Well Changtan 1 in southern Ordos Basin and its significance[J]. China Petroleum Exploration, 2021, 26(3): 68-78.

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