| LIU Zhen,SUN Zhipeng,WANG Zisong,ZHANG Wei,LI Tingan,HE Weijun,LI Fengxia,CAO Shang,LIU Jingjing,LIN Lu. 2016. Evaluation of abundant hydrocarbon-generation depressions in the deepwater area of Qiongdongnan Basin, South China Sea. Acta Oceanologica Sinica, 35(2):137－144 |
| Evaluation of abundant hydrocarbon-generation depressions in the deepwater area of Qiongdongnan Basin, South China Sea |
| 琼东南深水区海陆过渡相富生烃凹陷评价及优选 |
| Received:August 20, 2014 Revised:October 31, 2015 |
| DOI：10.1007/s13131-015-0784-7 |
| Key words:comprehensive evaluation hydrocarbon-generation depressions source rocks deepwater area Qiongdongnan Basin |
| 中文关键词: 综合评价 富生烃凹陷 烃源岩 深水区 琼东南盆地 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LIU Zhen | Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China | liuzhenjr@163.com | | SUN Zhipeng | Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | WANG Zisong | PetroChina Jidong Oilfield Company, Tangshan 063000, China | | | ZHANG Wei | Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | LI Tingan | Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China | | | HE Weijun | Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | LI Fengxia | Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | CAO Shang | Research Institute of Yanchang Petroleum Group, Xi'an 710075, China | | | LIU Jingjing | Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China | | | LIN Lu | Shenzhen Branch of China National Offshore Oil Corporation (CNOOC) Limited, Guangzhou 510240, China | |
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| Abstract: |
| It has been confirmed that the key source rocks of Qiongdongnan Basin are associated with the Yacheng Formation, which was deposited in a transitional marine-continental environment. Because the distribution and evolution patterns of the source rocks in the major depressions are different, it is important to determine the most abundant hydrocarbon-generation depressions in terms of exploration effectiveness. Based on an analysis of organic matter characteristics of the source rocks, in combination with drilling data and seismic data, this paper establishes a model to evaluate the hydrocarbon-generation depressions in the deepwater area of Qiongdongnan Basin. First of all, by using the method of seismic-facies model analysis, the distribution of sedimentary facies was determined. Then, the sedimentary facies were correlated with the organic facies, and the distribution of organic facies was predicted. Meanwhile, the thickness of source rocks for all the depressions was calculated on the basis of a quantitative analysis of seismic velocity and lithology. The relationship between mudstone porosity and vitrinite reflectance (Ro) was used to predict the maturity of source rocks. Second, using the parameters such as thickness and maturity of source rocks, the quantity and intensity of gas generation for Yacheng and Lingshui Formations were calculated. Finally, in combination with the identified hydrocarbon resources, the quantity and intensity of gas generation were used as a guide to establish an evaluation standard for hydrocarbon-generation depressions, which was optimized for the main depressions in the Central Depression Belt. It is proposed that Lingshui, Ledong, Baodao and Changchang Depressions are the most abundant hydrocarbon depressions, whilst Songnan and Beijiao Depressions are rich hydrocarbon depressions. Such an evaluation procedure is beneficial to the next stage of exploration in the deep-water area of Qiongdongnan Basin. |
| 中文摘要: |
| 琼东南盆地古近系崖城组被证实为海陆过渡相烃源岩,但是深水盆地内6个凹陷的特征及演化存在显著差异,如何确定最富生烃的凹陷直接关系到深水钻探的成效。本文在深水凹陷区域构造形成机制、沉积环境演变特征以及海陆过渡相烃源岩有机质特征分析的基础上,充分利用现有钻井和地震资料,首先依据地震相模式分析方法预测了烃源岩层段沉积相分布,并根据沉积相与有机相的对应关系,预测了有机相分布;同时采用地震速度岩性定量分析技术确定出各凹陷烃源岩厚度分布,并利用地震反演速度及区域内泥岩孔隙度和烃源岩Ro的关系,定量预测了源岩热成熟度分布;然后依据烃源岩有机相、厚度和热成熟度等参数计算了崖城组各层段生气量和生气强度;最后以这两个参数为主,结合资源量和油气发现概况,建立了深水区富生烃凹陷评价标准,以此对6个凹陷进行综合评价优选。研究认为陵水、乐东、宝岛和长昌四个凹陷是Ⅰ类(最富生烃)凹陷,而松南和北礁凹陷为Ⅱ类(较富生烃)凹陷。该评价结果对南海北部深水区下一步勘探部署和目标钻探有重要的指导意义。 |
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