基于地震资料的探井钻前孔隙压力预测——以伊拉克A油田为例

doi:10.11743/ogg20150620

Abstract

Abstract: Pore pressure prediction before drilling is of great significance for ensuring drilling safety,choosing reasonable drilling mud density,designing well configuration,reducing drilling cost and protecting reservoirs.The accuracy of pressure prediction usually is not sufficient for drilling requirement due to a lack of logging data and multi-interpretation of seismic data.This paper focuses on an oilfield A in southwest of Iraq.To tackle the problem of inadequate exploration well data of deep layers and complicated seismic responses,we combined seismic data with regional geology and shallow well logging data to study the mechanisms behind pressure.We found out that the study area was controlled by fluid charging caused by lateral tectonic extruding and deep faulting.An optimized method for pre-drilling pressure prediction was picked out and improvement on the precision of the pore pressure calculating parameters was achieved through overburden pressure prediction based on seismic-well-integration,seismic velocity analyses based on geological consistency,and variation rate of seismic velocity estimation.Pore pressure coefficient of exploratory well in deep Jurassic was predicted to range between 1.95 and 2.05.The prediction was verified by actual measurement with an error less than 3% only.

Key words: pore pressure, pressure prediction, deep exploratory well, Jurassic, Iraq

CLC Number:

TE122.1

Chen Xin, Wei Xiaodong, Li Yanjing, Xia Yaliang, Zhou Xiaoming, Wang Gan, Wang Xiaotian. Pre-drilling pore pressure prediction based on seismic data for exploratory well: Oilfield A in Iraq[J]. Oil & Gas Geology, 2015, 36(6): 1038-1046.

References

[1] 赵文智,柳广弟,苗继军,等.异常地层压力成因与预测[M].北京:石油工业出版社,2004:100-131. Zhao Wenzhi,Liu Guangdi,Miao Jijun,et al.Abnormal pore pressure formation mechanism and prediction[M].Beijing:Petroleum Industry Press,2004:100-131.
[2] 王兴岭,冯斌.井约束地震压力预测在滚动勘探开发中的应用[J].石油地球物理勘探,2002,37(4):391-394. Wang Xingling,Feng Bin.Seismic pressure prediction constrained by well applies in rolling exploration and development[J].Petroleum Geophysical Prospecting,2002,37(4):391-394.
[3] Daniel Mujica,Abdulfattah Aldajani.Pore pressure prediction from 3D seismic data:a feasibility study for unconventional gas in Saudi Arabia[C]//Annual International Meeting,SEG,Expanded Abstracts,2013,83^th:2331-2335.
[4] Niranjan Banik,Adam Koesoemadinata,Charles Wagner,et al.Predrill pore-pressure prediction directly from seismically derived acoustic impedance[C]//Annual International Meeting,SEG,Expanded Abstracts,2013,83^th:2905-2909.
[5] Krongrath Suwannasri,Namfon Pooksook,Paveen Suthisripok,et al.Seismic velocity-based pore pressure and fracture gradient prediction in high temperature reservoirs:Bongkot field,Gulf of Thailand[C].Annual International Meeting,SEG,Expanded Abstracts,2013,83^th:2336-2340.
[6] Banik N Wool,G den Boer,L Mao,et al.Regional and high-resolution 3D pore-pressure prediction in deep-water offshore West Africa[C]//Annual International Meeting,SEG,Expanded Abstracts,2003,73^rd:1386-1389.
[7] Nader C Dutta,Jalal Khazanehdari.Estimation of formation fluid pressure using high-resolution velocity from inversion of seismic data and a rock physics model based on compaction and burial diagenesis of shales[C]//Annual International Meeting,SEG,Expanded Abstracts,2006,76^th:1528-1539.
[8] Alan R.Huffman and Richard W.Lahann.Geophysical Fluid Pressure Prediction in The Presence of Multiple Pressure Mechanisms and Complex Geology with Applications to Deep Wells[C]//Annual International Meeting,SEG,Expanded Abstracts,2008,78^th:2673.
[9] 袁静,陈鑫.济阳坳陷古近系深部储层成岩-孔隙演化模式[M].东营:中国石油大学出版社,2011. Yuan Jing,Chen Xin.The diagenesis-porosity evolution model of Paleogene deep reservoir in Jiyang depression[M].Dongying:China University of Petroleum Press,2011.
[10] Deng Xiaowu.The petroleum geology in Iraq[M].Electronic publishing of Iraq,2010.
[11] Pennebaker E S.Seismic data indicate depth,magnitude of abnormal pressure[J].World Oil,1968,166:73-78.
[12] Dutta N.Geopressure prediction using seismic data:current status and the road ahead[J].Geophysics,2002,67:2012-2041.
[13] Gary Yu.How does seismic data quality influence pore pressure estimation and interpretation?[C]//Annual International Meeting,SEG,Expanded Abstracts,2009,79^th:3208-3212.
[14] Rajive Kumar,Mariam A Al-Saeed,Jassim M,et al.Seismic based pore pressure prediction in a West Kuwait field[C]//Annual International Meeting,SEG,Expanded Abstracts,2010,80^th:2289-2293.
[15] 云美厚.地震地层压力预测[J].石油地球物理勘探,1996,31(4): 575-586. Yun Meihou.Prediction of seismic formation pressure[J].Petroleum Geophysical Prospecting,1996,31(4):575-586.
[16] Eaton B A.Graphical method predicts geopressures worldwide[J].World Oil,1972,51-56.
[17] Eaton B.The equation for geopressure prediction from well logs [C]//Fall Meeting of the Society of Petroleum Engineers of AIME,1975,5554:1-5.
[18] Eberhart-Phillips D,Han D,Zoback M.Empirical relationships among seismic velocity,effective pressure,porosity and clay content in sandstone[J].Geophysics,1989,54:82-89.
[19] 樊洪海.利用声速检测欠压实泥岩异常高压的简易方法与应用[J].石油钻探技术,2001,(29):9-11. Fan Honghai.Simple method and application to detect abnormal high pressure of uncompacted mudstone using sound velocity[J].Petroleum Drilling Technology,2001,(29):9-11.
[20] Bowers G.Pore pressure estimation from velocity data:accounting from overpressure mechanisms besides undercompaction[J].SPE Drilling & Completion,1995,10:89-95.
[21] Fillippone W R.On the prediction of abnormally pressured sedimentary rocks from seismic data[C]//Offshore Technology Conference,1979:2667-2676.
[22] Fillippone W.Estimation of Formation Parameters and the Prediction of Overpressures from Seismic Data[C]//Annual International Meeting,SEG,Expanded Abstracts,1982,62^nd:502-503.
[23] 刘震,张万选.辽西凹陷北洼下第三系异常地层压力分析[J].石油学报,1993,14(1):14-23. Liu Zhen,Zhang Wanxuan.An analysis of abnormal formation pressure of Paleogene in the north sag of Liaoxi depression[J].Acta Petrolei Sinica,1993,14(1):14-23.
[24] Mita Sengupta,Jianchun Dai.Building a seismic-driven 3D geomechanical model in a deep carbonate reservoir[C]//Annual International Meeting,SEG,Expanded Abstracts,2011,81^th:2069-2073.
[25] Cibin P,Martera M,Buia M,et al.What seismic velocity field for pore-pressure prediction?[C]//Annual International Meeting,SEG,Expanded Abstracts,2004,74^th:1531-1534.
[26] Y.Ranjeet Singh,Metilda Pereira,R.K.Srivastava,et al.Regional Pressure Compart-mentalisation Preview using Pore Pressure Approach-A Case study from NE India[C]//Annual International Meeting,SEG,Expanded Abstracts,2010,80^th:2217-2230.

Pre-drilling pore pressure prediction based on seismic data for exploratory well: Oilfield A in Iraq

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

[1]	Hui PAN, Yuqiang JIANG, Xun ZHU, Haibo DENG, Linke SONG, Zhanlei WANG, Miao LI, Yadong ZHOU, Linjie FENG, Yongliang YUAN, Meng WANG. Evaluation of geological sweet spots in fluvial tight sandstone gas： A case study of the first submember of the second member of the Jurassic Shaximiao Formation， central Sichuan Basin [J]. Oil & Gas Geology, 2024, 45(2): 471-485.
[2]	Ruyue WANG, Zongquan HU, Fuqiang LAI, Yuejiao LIU, Zhonghu WU, Jianhua HE, Guan’gui ZOU, Pengwei WANG, Zhihao LI. Brittleness features and controlling factors of continental shale from Da’anzhai Member of the Lower Jurassic Ziliujing Formation， northeastern Sichuan Basin [J]. Oil & Gas Geology, 2023, 44(2): 366-378.
[3]	Haihua Zhu, Lin Chen, Zhenglin Cao, Minglei Wang, Haitao Hong, Yucong Li, Rui Zhang, Shaomin Zhang, Guangyi Zhu, Xu Zeng, Wei Yang. Microscopic pore characteristics and controlling factors of black shale in the Da’anzhai Member of Jurassic Ziliujing Formation， central Sichuan Basin [J]. Oil & Gas Geology, 2022, 43(5): 1115-1126.
[4]	Qianwen Li, Zhongbao Liu, Feiran Chen, Guangxiang Liu, Dianwei Zhang, Peng Li, Pengwei Wang. Lithofacies types and reservoir characteristics of Jurassic shale in the Sichuan Basin revealed by the Da’anzhai Member， Well Y2， Yuanba area [J]. Oil & Gas Geology, 2022, 43(5): 1127-1140.
[5]	Shuai Yin, Zhonghu Wu, Xiaoming Wu, Jianping Liu, Chengqian Tan, Ruyue Wang, Hui Yuan, Yawei Dai. Oil enrichment law of the Jurassic Yan’an Formation， Hongde block， Longdong area， Ordos Basin [J]. Oil & Gas Geology, 2022, 43(5): 1167-1179.
[6]	Pengwei Wang, Xiao Chen, Zhongbao Liu, Wei Du, Donghui Li, Wujun Jin, Ruyue Wang. Reservoir pressure prediction for marine organic-rich shale： A case study of the Upper Ordovician Wufeng-Lower Silurian Longmaxi shale in Fuling shale gas field， NE Sichuan Basin [J]. Oil & Gas Geology, 2022, 43(2): 467-476.
[7]	Shasha Sun, Dazhong Dong, Yucong Li, Hongyan Wang, Zhensheng Shi, Shiwei Huang, Yan Chang, Wenhua Bai. Geological characteristics and controlling factors of hydrocarbon accumulation in terrestrial shale in the Da'anzhai Member of the Jurassic Ziliujing Formation, Sichuan Basin [J]. Oil & Gas Geology, 2021, 42(1): 124-135.
[8]	Zhongbao Liu, Zongquan Hu, Guangxiang Liu, Zhujiang Liu, Haotian Liu, Jingyu Hao, Pengwei Wang, Peng Li. Pore characteristics and controlling factors of continental shale reservoirs in the Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin [J]. Oil & Gas Geology, 2021, 42(1): 136-145.
[9]	Zhiguo Shu, Lin Zhou, Xiong Li, Haotian Liu, Yong Zeng, Hongguang Xie, Mingjun Yao, Yanchun Wang. Geological characteristics of gas condensate reservoirs and their exploration and development prospect in the Jurassic continental shale of the Dongyuemiao Member of Ziliujing Formation, Fuxing area, eastern Sichuan Basin [J]. Oil & Gas Geology, 2021, 42(1): 212-223.
[10]	Zhe Mao, Lianbo Zeng, Guoping Liu, Zhiyong Gao, He Tian, Qing Liao, Yunzhao Zhang. Characterization and effectiveness of natural fractures in deep tight sandstones at the south margin of the Junggar Basin, northwestern China [J]. Oil & Gas Geology, 2020, 41(6): 1212-1221.
[11]	Xianyu Mao, Benbiao Song, Rubing Han, Changbing Tian, Baozhu Li, Haiqiang Song. Depositional characteristics of tidal channel facies in carbonate ramp of the Cretaceous Mishrif Formation in southern Iraq [J]. Oil & Gas Geology, 2020, 41(6): 1233-1243, 1256.
[12]	Peng Wang, Linghui Sun, He Wang, Zi'an Li. Microscopic pore structure of Ahe tight sand gas reservoirs of the Low Jurassic in Kuqa Depression and its controls on tight gas enrichment [J]. Oil & Gas Geology, 2020, 41(2): 295-304.
[13]	Tian Jixian, Li Jian, Zeng Xu, Kong Hua, Wang Peng, Sha Wei, Wang Mu, Shi Zhenghao, Song Dekang. Accumulation conditions and favorable plays for deep gas exploration at the northern margin of Qaidam Basin [J]. Oil & Gas Geology, 2019, 40(5): 1095-1105.
[14]	Liu Yukun, He Sheng, He Zhiliang, Zhang Dianwei, Li Tianyi, Wang Xiaolong, Guo Xiaowen. The rock physics modeling experiment under overpressure and theoretical model for overpressure prediction in carbonate rocks [J]. Oil & Gas Geology, 2019, 40(4): 716-724.
[15]	Xu Zeyang, Zhao Jingzhou, Li Jun. The impact of organic matter content on overpressure analysis and its correction method in the first member of Cretaceous Qingshankou Formation, Placanticline area, Songliao Basin [J]. Oil & Gas Geology, 2019, 40(4): 938-946.