| 陆相湖盆细粒岩油气的概念、特征及勘探意义:以渤海湾盆地沧东凹陷孔二段为例 |
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| 引用本文： | 周立宏,蒲秀刚,陈长伟,杨飞,夏君,官全胜,黄传炎. 陆相湖盆细粒岩油气的概念、特征及勘探意义:以渤海湾盆地沧东凹陷孔二段为例[J]. 地球科学, 2018, 43(10): 3625-3639. DOI: 10.3799/dqkx.2018.990 |
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| 作者姓名： | 周立宏 蒲秀刚 陈长伟 杨飞 夏君 官全胜 黄传炎 |
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| 作者单位： | 1.中国石油天然气股份有限公司大港油田分公司, 天津 300280 |
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| 基金项目： | 中国石油股份公司重大科技专项2018E-11-01 |
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| 摘 要： | 陆相湖盆致密油气与传统致密油气和页岩油气有相关性，也体现出较大的差异性.通过对渤海湾盆地沧东凹陷孔店组二段（孔二段）优质"生油岩"开展岩性、物性、生烃特性、含油性、脆性综合分析及勘探实践，发现了一种赋存于陆相湖盆细粒沉积岩（粒径小于62.5 μm）之中的油气，并提出了细粒岩油气的概念.细粒岩油气不同于传统的致密油气和页岩油气，具有以细粒沉积为主，主要发育碳酸盐岩、细粒长英沉积岩、细粒混合沉积岩3种岩类；纵向上表现为纹层状或块状沉积，平面上稳定分布；3种岩性均具备良好的生烃条件，均具有一定的储集空间，均有明显的含油气特征，脆性矿物含量均较高，具有较好的可压裂性.该类油气藏在空间上连续稳定分布，整体含油气，甜点段富集高产，通过分段分簇大型压裂改造，具备长期稳产的有利条件，是陆相湖盆非常规油气勘探的重点领域.
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| 关 键 词： | 陆相湖盆 沧东凹陷 孔二段 细粒沉积岩 细粒岩油气 石油地质 |
| 收稿时间： | 2018-06-10 |
Concept,Characteristics and Prospecting Significance of Fine-Grained Sedimentary Oil Gas in Terrestrial Lake Basin: A Case from the Second Member of Paleogene Kongdian Formation of Cangdong Sag,Bohai Bay Basin |
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| Abstract: | The tight oil and gas in terrestrial lacustrine basin shows great differences from the traditional tight/shale oil and gas.The second Member of Paleogene Kongdian Formation is an important souce rock of Cangdong Sag, Bohai Bay Basin, based on the comprehensive analysis of lithology, physical properties, hydrocarbon generation characteristics, oiliness, brittleness and exploration practice, an new oil gas reservoir was discovered in fine-grained sedimentary rocks in terrestrial lake basin, the concept of fine-grained sedimentary oil reservoir was proposed which is different from traditional tight oil gas and shale oil gas. Fine-grained sedimentary rock is mainly composed of carbonate rock, fine-grained feldspar-quartzose sedimentary rock and fine-grained mixed sedimentary rock and has the characteristic of vertically thin interbed deposits, stable plane distribution, fine hydrocarbon generation conditions, certain reservoir space, obvious hydrocarbon characteristics, high content of brittle minerals and good fracturability. These reservoirs are continuously and stably distributed in space, containing oil gas as a whole, and the dessert section is enriched, featuring high-yield. With favorable long-term stable production conditions through segmented clumps and fracturing reconstruction, it is the key areas for unconventional oil and gas exploration in terrestrial lake basin. |
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