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| 柴北缘中侏罗统湖相泥页岩储层矿物组成与脆性特征 | |
| 引用本文： | 原园,姜振学,喻宸,郭天旭,申玉山,赵若彤.柴北缘中侏罗统湖相泥页岩储层矿物组成与脆性特征[J].高校地质学报,2015,21(1):117. |
| 作者姓名： | 原园 姜振学 喻宸 郭天旭 申玉山 赵若彤 |
| 作者单位： | 1. 中国石油大学油气资源与探测国家重点实验室,北京102249;中国石油大学非常规天然气研究院,北京102249 2. 中国石油大学油气资源与探测国家重点实验室,北京,102249 3. 国土资源部油气资源战略研究中心,北京,100034 4. 中国石油青海油田公司勘探开发研究院,敦煌,736202 |
| 基金项目： | 国家重大专项“页岩气成藏主控因素研究”，国土资源部项目“典型富有机质页岩储集能力及其控制因素研究(12120114046701)”资助 |
| 摘 要： | 运用X射线衍射技术,对柴北缘中侏罗统46块岩心泥页岩样品和15块露头泥页岩样品进行了定性和定量分析。结果表明研究区泥页岩矿物成分中黏土矿物含量最高,介于33%~79.7%之间,平均54.3%;其次为石英,含量介于14.5%~57.8%之间,平均35.4%;碳酸盐矿物含量较少,总量一般介于0~13%之间,个别样品大于15%,露头样品与岩心样品矿物成分有差别。黏土矿物组合特征反映出研究区进入中成岩阶段,对应有机质演化的成熟阶段,具有适宜页岩油气形成的成熟度条件。扫描电镜显示,研究区泥页岩发育3种孔隙类型。与海相页岩相比,柴北缘中侏罗统泥页岩黏土矿物含量高但敏感性矿物含量低,石英、长石等脆性矿物含量偏低但达到湖相泥页岩开发标准,脆性指数平均为42.6%,整体上具有较好的脆性和可压性,有利于该区湖相页岩的压裂改造。 |
| 关 键 词： | 泥页岩储层 矿物成分 脆性特征 X 射线衍射 中侏罗统 柴达木盆地北缘 |
Mineral Compositions and Brittleness of the Middle Jurassic Iacustrine Shale Reservoirin Northern Qaidam Basin |
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| YUAN Yuan,JIANG Zhenxue,YU Chen,GUO Tianxu,SHEN Yushan,ZHAO Ruotong.Mineral Compositions and Brittleness of the Middle Jurassic Iacustrine Shale Reservoirin Northern Qaidam Basin[J].Geological Journal of China Universities,2015,21(1):117. | |
| Authors: | YUAN Yuan JIANG Zhenxue YU Chen GUO Tianxu SHEN Yushan ZHAO Ruotong |
| Abstract: | X-ray diffraction (XRD) was used to qualitatively and quantitatively analyze Middle Jurassic lacustrine shale samples from the northern Qaidam Basin. Results revealed that clay minerals were dominant with a range of 33%~79.7% and averaged in 54.3%. Quartz mineral ranged from 14.5% to 57.8% with an average of 35.4%. Carbonate mineral ranged from 0 to 15%. Clay mineral compositions show a middle diagenetic stage, corresponding to a mature evolutionary stage of hydrocarbons with a suitable maturity condition for shale oil and gas formation. Three types of pores were found in the study area including intragranular pore, intergranular pore, and marco fracture. Compared with marine shales, Middle Jurassic lacustrine shales in the northern Qaidam Basin have higher content of clay minerals, less sensitive mineral, and relatively lower content of brittle minerals such as quartz and feldspar but can meet criteria for the lacustrine shale gas reservoir exploitation. The average index of mineral brittleness was 42.6% suggesting a good property of brittleness and compressibility which is good for fracturing. |
| Keywords: | shale reservoir mineral compositions brittleness X-ray diffraction Middle Jurassic Northern Qaidam Basin |
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