页岩能源共生矿产成矿（藏）地质条件研究——以松辽盆地上白垩统青山口组为例
- 收稿日期:
2013-07-22
- 修回日期:
2014-03-17
- 刊出日期:
2014-06-10
摘要: 页岩能源矿产已成为国内外研究热点，并掀起一场“页岩革命”，其主要包括油页岩、页岩油、页岩气等非常规页岩能源资源。这套页岩能源矿产与富有机质泥岩密切相关，其在成因上存在一定的联系和共生规律，但成矿（藏）条件又存在明显的不同。松辽盆地上白垩统青山口组发育厚层的暗色泥岩，由于其面积巨大，泥岩中有机质丰度高，埋藏深度差异明显，具备形成页岩能源共生矿产成矿（藏）的地质条件。初步分析认为，松辽盆地青山口组下部暗色泥岩有机质丰度较高，有机质类型主要为I~II1型，为油页岩成矿，页岩油、页岩气成藏提供足够的有机质来源，其中在松辽盆地东南隆起区，青山口组埋藏较浅（深度＜1 000 m），有机质热演化程度较低（Ro＜0.7%），为良好的油页岩成矿场所。埋藏浅的富有机质泥岩可能因微生物活动而形成生物成因页岩气，较弱的成岩压实作用和极为丰富的有机质为页岩气成藏提供足够的空间（孔隙度4%~14%）。从盆地东部的隆起带到中央凹陷区，随着埋深加大（深度＞1 000 m），热演化程度逐渐增强（Ro：0.7%~1.2%），基本处于成熟—过熟阶段，有机质大量排烃，为页岩油、页岩气成藏提供足够的来源。异常高压和排烃造孔形成良好的储层，使泥页岩具备页岩油、气成藏的良好条件。因此，松辽盆地可能存在呈环形的页岩能源矿产成矿（藏）规律，其中在东南隆起区和中央凹陷隆起地区为油页岩成矿和生物型页岩气有利成藏带；中央凹陷大部分地区可能为页岩油、热解型页岩气有利成藏带；中央凹陷埋藏最深部位可能发育热裂解型页岩气有利成藏带。
Research on Geological Conditions of Shale Coexistent Energy Mineralization (Accumulation): Take the Qingshankou Formation in Upper Cretaceous, Songliao Basin for example
- Received Date:
2013-07-22
- Rev Recd Date:
2014-03-17
- Publish Date:
2014-06-10
Abstract: Oil shale, shale oil and shale gas are the unconventional shale energy resources. They have already become domestic and foreign research hotspots, and brought about“shale revolution”. These mineral resources are closely related to organic rich shales. There is a connection and coexistent pattern in genesis among these mudstone mineral resources, but a big difference in metallogenic (accumulation) conditions. Thick dark mudstone developed in the upper Cretaceous Qingshankou Formation in the Songliao Basin. The distribution of strata is widespread with high abundance of organic matter, but the burial depth is of significant differences. Based on the previous studies, the organic matter content is very high in the Qingshankou Formation, and the kerogen type is I and II1. These geological conditions of this thick mudstone layer have the potential to accumulate the shale coexistent energy resources. In the southeast uplift of the Songliao Basin, it is initially thought that the Qingshankou Formation has a shallow depth (<1 000 m) and a low degree of organic thermal evolution (Ro: <0.7%), thus forming a better metallogenic place for oil shale. The shallow depth of organic rich shales maybe generate biogenetic shale gas due to microbial activities, and the weak compaction and abundant organic frameworks provide adequate space for shale gas reservoirs (porosity: 4%~14%) . From the eastern uplift to the central depression, the burial depth increased (>1 000 m) and the thermal evolution increased (Ro: 0.7%~1.2%). Organic matters mainly mature to over-mature and large quantity hydrocarbons were expelled, and they offered sufficient sources for shale oil and shale gas accumulation. Abnormal high pressure and hydrocarbon expulsion pore-creating to form well-developed reservoirs, emhancing the good conditions for oil shale and oil gas accumulation. Therefore, the energy of shale metallogenic(accumulation) regularity might be that, the southest uplift and some uplift areas of central transition zone are the potential accumulation belt of oil shale and biogenetic shale gas, and the large area of central transition zone is the accumulation belt of shale oil and pyrolysis shale gas, and the deepest central depression is the accumulation zone of cracking shale gas. These shale coexistent energy minerals are ringly distributed in the basin.
页岩能源共生矿产成矿（藏）地质条件研究——以松辽盆地上白垩统青山口组为例[J]. 沉积学报, 2014, 32(3): 593-600.
| 引用本文: |
页岩能源共生矿产成矿（藏）地质条件研究——以松辽盆地上白垩统青山口组为例[J]. 沉积学报, 2014, 32(3): 593-600.
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Research on Geological Conditions of Shale Coexistent Energy Mineralization (Accumulation): Take the Qingshankou Formation in Upper Cretaceous, Songliao Basin for example[J]. Acta Sedimentologica Sinica, 2014, 32(3): 593-600.
| Citation: |
Research on Geological Conditions of Shale Coexistent Energy Mineralization (Accumulation): Take the Qingshankou Formation in Upper Cretaceous, Songliao Basin for example[J]. Acta Sedimentologica Sinica, 2014, 32(3): 593-600.
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