| SU Long,ZHANG Dongwei,YANG Haizhang,CHEN Ying,CHEN Guojun,ZHENG Jianjing,XU Yongchang. 2018. Chemical kinetics evaluation and its application of natural gas generation derived from the Yacheng Formation in the deep-water area of the Qiongdongnan Basin, China. Acta Oceanologica Sinica, 37(1):50－59 |
| Chemical kinetics evaluation and its application of natural gas generation derived from the Yacheng Formation in the deep-water area of the Qiongdongnan Basin, China |
| 琼东南盆地深水区崖城组生成天然气的化学动力学及其应用 |
| Received:January 20, 2017 |
| DOI：10.1007/s13131-018-1158-8 |
| Key words:deep-water area geological prediction natural gas Yacheng Formation evaluation Qiongdongnan Basin |
| 中文关键词: 深水区 地质预测 天然气 崖城组 评价 琼东南盆地 |
| 基金项目:中国科学院“西部之光”人才培养计划项目“准东地区侏罗系各类烃源岩的生排烃特征及生烃潜力评价”（编号：Y404RC1）、“十三五”国家科技重大专项项目“南海北部深水区煤系与海相烃源岩生烃评价”(编号：2016ZX05026-007-005)、油气资源重点实验室开放基金“深层烃源岩生烃评价和生烃机理研究”（编号：KFJJ2013-04）和甘肃省重点实验室专项（编号：1309RTSA041）资助。 |
| Author Name | Affiliation | E-mail | | SU Long | Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China | longsu@lzb.ac.cn | | ZHANG Dongwei | Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | YANG Haizhang | Research Center of China National Offshore Oil Corporation, Beijing 100027, China | | | CHEN Ying | Research Center of China National Offshore Oil Corporation, Beijing 100027, China | | | CHEN Guojun | Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China | | | ZHENG Jianjing | Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China | | | XU Yongchang | Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China | |
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| Abstract: |
| The natural gas generation process is simulated by heating source rocks of the Yacheng Formation, including the onshore-offshore mudstone and coal with kerogens of Type II2-III in the Qiongdongnan Basin. The aim is to quantify the natural gas generation from the Yacheng Formation and to evaluate the geological prediction and kinetic parameters using an optimization procedure based on the basin modeling of the shallow-water area. For this, the hydrocarbons produced have been grouped into four classes (C1, C2, C3 and C4-6). The results show that the onset temperature of methane generation is predicted to occur at 110℃ during the thermal history of sediments since 5.3 Ma by using data extrapolation. The hydrocarbon potential for ethane, propane and heavy gaseous hydrocarbons (C4-6) is found to be almost exhausted at geological temperature of 200℃ when the transformation ratio (TR) is over 0.8, but for which methane is determined to be about 0.5 in the shallow-water area. In contrast, the end temperature of the methane generation in the deep-water area was over 300℃ with a TR over 0.8. It plays an important role in the natural gas exploration of the deep-water basin and other basins in the broad ocean areas of China. Therefore, the natural gas exploration for the deep-water area in the Qiongdongnan Basin shall first aim at the structural traps in the Ledong, Lingshui and Beijiao sags, and in the forward direction of the structure around the sags, and then gradually develop toward the non-structural trap in the deep-water area basin of the broad ocean areas of China. |
| 中文摘要: |
| 烃源岩生成天然气的过程，可以通过琼东南盆地海陆过渡相的崖城组泥岩和煤来模拟，其有机质类型为II2-III型。主要基于浅水区的地质模型，利用化学动力学方法，求取崖城组烃源岩的动力学参数，定量评价深水区天然气的生成及地质预测。为此，模拟了天然气中的甲烷、乙烷、丙烷和重烃（C4-6）四个组份。结果表明，该盆地自新构造期（5.3 Ma）以来，进入到沉积有机质的热裂解，外推生成甲烷的地温为110℃；当地温为200℃时，浅水区崖城组烃源岩生成的乙烷、丙烷和重烃（C4-6）的归一化转化率已达0.8，而甲烷的仅为0.5；通过对比可知，深水区甲烷的生成温度达300℃时，其归一化转化率才能达到0.8。这对于深水区盆地和我国其它海上含油气盆地天然气的生成和勘探非常有利。因此，我国海域的油气勘探，首要考虑琼东南盆地深水区的乐东凹陷、陵水和北礁凹陷的构造圈闭，其次为凹陷周边的凹中隆，最后为我国广泛海域及深水区盆地的非构造圈闭。 |
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