海相页岩烃源岩系中有机质的高温裂解生气潜力

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海相页岩烃源岩系中有机质的高温裂解生气潜力

郑民¹ 李建忠¹ 吴晓智¹ 王民² 陈晓明¹ 王文广^2,3

1 中国石油勘探开发研究院；2 中国石油大学（华东）；3 东北石油大学

出版日期:2014-06-15 发布日期:2014-06-15
作者简介:郑民（1979-），男，山东潍坊人，博士，2008 年毕业于中国科学院兰州地质研究所，高级工程师，主要从事油气资源战略及石油地质综合研究工作。地址：北京市海淀区学院路20 号中国石油勘探开发研究院油气资源规划所，邮政编码：100083。 E-mail：zhenmin@petrochina.com.cn
基金资助:
国家科技重大专项^“中国大型油气田及煤层气勘探开发技术发展战略（二期）^”（2011ZX05043）; 中国石油天然气集团公司重大科技专项^“第四次油气资源评价^”(2013E-0502); 中国石油勘探开发研究院创新项目（2012Y-006）。

High-temperature Pyrolysis Gas-sourcing Potential of Organic Matter in Marine Shale Source Rock System

Zheng Min¹, Li Jianzhong¹, Wu Xiaozhi¹, Wang Min², Chen Xiaoming¹, Wang Wenguang^2,3

1 PetroChina Research Institute of Petroleum Exploration & Development; 2 China University of Petroleum (East China); 3 Northeast University of Petroleum

Online:2014-06-15 Published:2014-06-15

摘要/Abstract

摘要： 海相页岩烃源层系具备晚期高温裂解生气的能力。以上扬子地区寒武系筇竹寺组、志留系龙马溪组及华北地区长城系—青白口系下马岭组为例，通过封闭系统与开放系统对海相泥页岩烃源岩的晚期生气潜力进行了研究，确定了海相泥页岩具备晚期高温裂解生气潜力，并运用晚期生气能力参数(LGP) 和晚期生气类型比(LGT) 两项参数对海相泥页岩烃源岩的高温裂解生气能力进行评价。烃源岩的热演化生烃过程是一个非常复杂的过程，在发生热裂解生烃的同时，也通过缩聚反应生成一定量的耐熔大分子——杂原子化合物（NSOs），在高温演化阶段杂原子化合物发生裂解并产生烃气。岩石热解实验显示，筇竹寺组与龙马溪组高演化阶段的烃源岩样品仍然有热解烃类产出，例如样品SP-1 在R_o=2.42% 以后仍然得到0.092mg/g（HC/TOC），表明了高演化程度下烃源岩仍具有生烃能力，但生烃产率较低。以LGP —LGT 为标准评价了海相泥页岩晚期生气能力，所测海相泥页岩LGT >1，说明具备晚期生成B 型高温裂解气的能力；而LGP分布在0.51 到0.55 之间，说明具备中等高温裂解生气潜能。所测样品高温裂解平均生气潜力为2.6mg/g（HC/TOC），属于较低的天然气产率，折算下来约0.2m³/t（HC/ 岩石）。以我国蜀南地区志留系龙马溪组页岩气为例，实测含气量约3m³/t（HC/ 岩石），则高温裂解产气将占到6.7%。

Abstract: The marine shale source rock system has the high-temperature pyrolysis gas-sourcing ability in the later period. Take for examples the Cambrian Qiongzhusi Formation and Silurian Longmaxi Formation in the Yangtze area and the Changcheng-Qingbaikou Xiamaling Formation in North China area. The gas-sourcing potential of marine mud shale source rock in the later period is brought under study on the basis of the closed system and the open system to determine whether marine mud shale has the high-temperature pyrolysis gas sourcing ability in the later period. Two parameters – LGP and LGT – are used to evaluate the high-temperature pyrolysis gas-sourcing ability. The thermal development process of gas from source rock is a very complicated process. When thermal pyrolysis hydrocarbon sourcing takes place, a certain quantity of melting-resistant molecule – NSOs – is generated from condensation polymerization. NSOs is cracked into hydrocarbon gas under the high-temperature development stage. The rock pyrolysis experiment shows that the samples of source rock from Qiongzhusi Formation and Longmaxi Formation can produce heat-cracked hydrocarbons under the high-temperature development stage. For example, SP-1 can still produce 0.092mg/g (HC/TOC) after R_o =2.42%, indicating that source rock can still keep the sourcing ability under the hightemperature development stage, but the sourcing efficiency is low. The LGP - LGT standard is used to evaluate the gas-sourcing ability of marine mud shale in the later period. LGT of the inspected marine mud shale is >1, indicating the ability to produce high-temperature cracked gas of B type in the later period. LGP is distributed between 0.51 and 0.55, indicating the medium-level potential for high-temperature cracked gas. The average potential of inspected samples for high-temperature cracked gas is 2.6 mg/g (HC/TOC), belonging to the relatively low natural gas productivity. Based on calculation, it is about 0.2 m³/t (HC/rock). Take shale from the Silurian Longmaxi Formation in China^’s Shunan area for instance. The actually inspected gas content is about 3m³/t (HC/rock). The high-temperature cracked gas will account for 6.7 percent.

郑民,李建忠,吴晓智,王民,陈晓明,王文广. 海相页岩烃源岩系中有机质的高温裂解生气潜力[J]. .

Zheng Min,Li Jianzhong,Wu Xiaozhi,Wang Min,Chen Xiaoming and Wang Wenguang. High-temperature Pyrolysis Gas-sourcing Potential of Organic Matter in Marine Shale Source Rock System[J]. .