Application of seismic exploration technology in forecasting unconventional gas enrichment area of coal measures

Authors

WANG Shuwei, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China

Abstract

For forecasting unconventional gas enrichment area in coal measures of eastern Ordos basin, seismic exploration was used to forecast the gas in this new field. First of all, it took the post-stack impedance inversion to forecast the lithology of the reservoir, it can get the number of sample points from the impedance threshold, and get the thickness of time by cal-culating the sampling rate, after that it can get the strata thickness by multiplying the thickness of time and the velocities of strata; second, it took the pre-stack AVO inversion to forecast the lithology gas-bearing properties of the reservoir, based on analyzing the relationship between gas saturation and the related AVO attribute parameters, we got the most sensitive attrib-ute parameter of the favorable gas bearing areas. At last, it took the thicker reservoir and the low pseudo-Poisson's ratio at-tribute feature as the favorable gas bearing areas, and it forecasted the enrichment area of sandstone gas and shale gas in eighth member of Shihezi Formation, Shanxi Formation and Benxi Formation of the exploration area, and drilling verified that the effect is good. The result of forecasting the enrichment area shows that seismic exploration forecasting this new field of unconventional gas enrichment area in coal measures in this region is feasible, and this method has a reference meaning for forecasting unconventional gas enrichment area in coal measures in other areas.

Keywords

eastern Ordos basin, unconventional gas in coal measures, impedance inversion, AVO inversion, low pseu-do-Poisson's ratio

DOI

10.3969/j.issn.1001-1986.2019.04.024

Recommended Citation

W. (2019) "Application of seismic exploration technology in forecasting unconventional gas enrichment area of coal measures," Coal Geology & Exploration: Vol. 47: Iss. 4, Article 25.
DOI: 10.3969/j.issn.1001-1986.2019.04.024
Available at: https://cge.researchcommons.org/journal/vol47/iss4/25

Reference

[1] 吕振华,齐亚林,孟令涛. 鄂尔多斯盆地西北部地区侏罗系成藏主控因素研究[J]. 新疆石油天然气,2016,12(1):19-24. LYU Zhenhua,QI Yalin,MENG Lingtao. Factors of Ju-rassic reservoir master northwestern of Ordos basin[J]. Xinjiang Oil & Gas,2016,12(1):19-24.

[2] 孙建博,姜呈馥,尹锦涛,等. 鄂尔多斯盆地宜川地区煤层气储层特征及勘探潜力分析[J]. 中国煤层气,2014,11(5):7-10. SUN Jianbo,JIANG Chengfu,YIN Jintao,et al. Characteristics of CBM reservoirs and exploration potential in Yichuan region of Ordos basin[J]. China Coalbed Methane,2014,11(5):7-10.

[3] 张建军,刘红星,孙强,等. "两宽一高"地震采集技术在鄂东缘致密砂岩气藏勘探中的应用[J]. 石油地球物理勘探,2018,53(增刊2):1-7. ZHANG Jianjun,LIU Hongxing,SUN Qiang,et al. Broadband,wide-azimuth and high-density seismic acquisition for the tight sand gas exploration in the east margin of Ordos basin[J]. Oil Geophysical Prospecting,2018,53(S2):1-7.

[4] 陈洋. 四川盆地巫溪地区页岩气地震勘探关键技术应用研究[D]. 成都:西南石油大学,2017.

[5] 曹代勇,刘亢,刘金城,等. 鄂尔多斯盆地西缘煤系非常规气共生组合特征[J]. 煤炭学报,2016,41(2):277-285. CAO Daiyong,LIU Kang,LIU Jincheng,et al. Combina-tion characteristics of unconventional gas in coal measure in the west margin of Ordos basin[J]. Journal of China Coal Society,2016,41(2):277-285.

[6] LAW B E. Introduction to unconventional petroleum sys-tems[J]. The American Association of Petroleum Geologists Bulletin,2002,86(11):1851-1852.

[7] 姚海鹏,朱炎铭,刘宇,等. 鄂尔多斯盆地伊陕斜坡北部煤系非常规天然气成藏特征[J]. 科学技术与工程,2018,18(3):160-167. YAO Haipeng,ZHU Yanming,LIU Yu,et al. The accumulation features of unconventional gas in coal-bearing strata in the north of Yishan slope in Ordos basin[J]. Science Technology and Engineering,2018,18(3):160-167.

[8] CURTIS J B. Fractured shale-gas systems[J]. The American Association of Petroleum Geologists Bulletin,2002:86(11):1921-1938.

[9] 随峰堂,窦新钊. 两淮煤田煤系非常规天然气的系统研究及其意义[J]. 山西煤炭,2016,36(5):18-20. SUI Fengtang,DOU Xinzhao. Systematic research and its significance of unconventional natural gas in coal measures in Huainan and Huaibei coal fields[J]. Shan Xi Mei Tan,2016,36(5):18-20.

[10] 贾跃玮,王丹,魏水建,等. 金山气田致密砂岩储层含气性叠前地震预测方法研究[J]. 物探化探计算技术,2017,39(5):626-631. JIA Yuewei,WANG Dan,WEI Shuijian,et al. Study of pre-stack seismic prediction on Tight-sand reservoir gas-bearing of Jinshan gas field[J]. Computing Techniques for Geophysical and Geochemical Exploration,2017,39(5):626-631.

[11] 张虎. 兴城-丰乐地区深层三维地震资料精细解释及储层预测研究[D]. 西安:西安石油大学,2015.

[12] 申有义,田忠斌,王建青,等. 地震非线性随机反演技术在煤层气储层厚度预测中的应用[J]. 煤田地质与勘探,2018,46(2):177-183. SHEN Youyi,TIAN Zhongbin,WANG Jianqing,et al. Application of seismic nonlinear stochastic inversion technique in prediction of CBM reservoir thickness[J]. Coal Geology & Exploration,2018,46(2):177-183.

[13] 赵胜天. 叠前AVO反演与属性分析[D]. 西安:西安石油大学,2008.

[14] 史运华. 多波叠前AVA参数反演方法及精度分析[D]. 成都:成都理工大学,2010.

[15] 原福堂,董红,朱再文,等. 地质统计随机反演与稀疏脉冲反演在储层预测中的应用对比[J]. 石油天然气学报,2014,36(7):55-60. YUAN Futang,DONG Hong,ZHU Zaiwen,et al. Appli-cation comparison between sparse spike inversion and geostatistical inversion in reservoir prediction[J]. Journal of Oil and Gas Technology,2014,36(7):55-60.

[16] 潘昱洁,李大卫,杨锴. 确定性反演和随机反演对井约束条件的需求分析[J]. 石油物探,2011,50(4):345-349. PAN Yujie,LI Dawei,YANG Kai. The requirement analysis about well constraint condition of deterministic inversion and inversion random[J]. Geophysical Prospecting for Petroleum,2011,50(4):345-349.

[17] 左卫华. 测井约束2D地震反演预测煤层及上部砂岩厚度[J]. 工程地球物理学报,2018,15(2):181-188. ZUO Weihua. The prediction of coal seam and upper sand-stone thickness using well logging constrained 2D seismic inversion technique[J]. Chinese Journal of Engineering Geophysics,2018,15(2):181-188.

[18] 解吉高,刘春成,刘志斌,等. 下刚果盆地北部中新统深水浊积岩储层及含油性地震预测[J]. 石油学报,2015,36(1):33-40. XIE Jigao,LIU Chuncheng,LIU Zhibin,et al. Seismic prediction of the reservoir and oil-bearing property of Miocene deep-water turbidite in northern Lower Congo basin[J]. Acta Petrolei Sinica,2015,36(1):33-40.

[19] 刘明全,肖为,冯全雄,等. 莺歌海盆地中深层高温高压河道砂岩储层含气性检测新方法[J]. 天然气工业,2016,36(6):30-35. LIU Mingquan,XIAO Wei,FENG Quanxiong,et al. A new gas-bearing detection method for medium and deep channel sand reservoirs under high temperatures and high pressures in the Yinggehai basin[J]. Natural Gas Industry,2016,36(6):30-35.

[20] 李龙龙,周创飞,张博,等. 胡尖山油田安83区块超低渗油藏井网适应性分析[J]. 石油化工应用,2013,32(3):51-54. LI Longlong,ZHOU Chuangfei,ZHANG Bo,et al. The oilfield safety Hujianshan 83 block of ultra-low permeability reservoirs well network adaptability analysis[J]. Petrochemical Industry Application,2013,32(3):51-54.

[21] 王建立,明君,夏同星,等. 弹性参数坐标旋转法在薄互储层定量描述中的应用[J]. 大庆石油地质与开发,2015,34(2):144-147. WANG Jianli,MING Jun,XIA Tongxing,et al. Application of elastic parameter coordinate rotation method in the quantitative characterization of the thin interbedded reservoirs[J]. Petroleum Geology and Oilfield Development in Daqing,2015,34(2):144-147.