挤压构造地层压力预测模型研究
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摘要
搞好地层压力预测,能够为钻井参数选择和井身结构设计提供准确的基础数据。针对目前某研究地区MR油田所在地层中存在逆掩推覆构造和挤压构造,已钻入地层中普遍存在异常高压,而其地震层速度和测井声波时差资料都无异常表现,采用常规的地层压力预测方法对该区块进行地层压力预测时会产生很大的误差。分析其原因,主要是挤压构造作用使该地区产生高压。引入相对挤压构造应力和构造压力因子对现有的地层压力预测模型进行了修正,建立了挤压构造条件下的地层压力预测模型。现场应用试验表明,修正的地层压力预测模型大大提高了挤压构造地区的地层压力预测精度。
During oil exploring and drilling process,it is very important to predict formation pressure accurately,because it can supply pressure technique data for drilling parameter select and well structure design.There are over-thrust folding structure and compression structure in the formations of MR Oilfield,and there exists the overpressure in the drilled formation.However,there are no abnormal expressions in the seismic interval velocity and logging information of interval travel time.There shows serious error using the traditional prediction methods in this block.The effect of compression structure stress is the main reason for producing overpressure.The relative compression structure stress and structural pressure factors were cited to correct the traditional prediction models.The applications of the corrected prediction models on site showed that the predictive accuracy of formation pressure could be greatly improved.
During oil exploring and drilling process,it is very important to predict formation pressure accurately,because it can supply pressure technique data for drilling parameter select and well structure design.There are over-thrust folding structure and compression structure in the formations of MR Oilfield,and there exists the overpressure in the drilled formation.However,there are no abnormal expressions in the seismic interval velocity and logging information of interval travel time.There shows serious error using the traditional prediction methods in this block.The effect of compression structure stress is the main reason for producing overpressure.The relative compression structure stress and structural pressure factors were cited to correct the traditional prediction models.The applications of the corrected prediction models on site showed that the predictive accuracy of formation pressure could be greatly improved.
引文
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[10]罗晓容.构造应力超压机制的定量分析[J].地球物理学报,2004,47(6):1086-1093.Luo Xiaorong.Quantitative analysis on overpressuring mecha-nism resulted from tectonic stress[J].Chinese Journal of Geo-physics,2004,47(6):1086-1093.
[11]石万忠,陈红汉,何生.库车坳陷构造挤压增压的定量评价及超压成因分析[J].石油学报,2007,28(6):59-65.Shi Wanzhong,Chen Honghan,He Sheng.Quantitative evalua-tion on contribution of structural compression to overpressureand analysis on origin of overpressure in Kuqa Depression[J].Acta Petrolei Sinica,2007,28(6):59-65.
[12]Luo X R,Vasseur G.Contributions of compaction and aquather-mal pressuring to geopressure and the influence of environmentalconditions[J].AAPG Bulletin,1992,76(10):1550-1559.
[2]Sleep N H,Blanpied M L.Creep,compaction and the weak rheol-ogy of major faults[J].Nature,1983,359(5):687-692.
[3]况军.准噶尔盆地南缘超压泥岩层及其构造地质意义[J].石油实验地质,1993,15(2):168-173.Kuang Jun.The superpressure mud seams in the southern mar-gin of the Junggar basin and their significance in structural geolo-gy[J].Petroleum Geology&Experiment,1993,15(2):168-173.
[4]Fertl W H.Abnormal formation pressure,implication to explora-tion,drilling,and production of oil and gas reservoirs[M].Am-sterdam:Elsevier,1976:382.
[5]Bethke C M.Inverse hydrologic analysis of the distribution andorigin of Gulf Coast-type geopressured zones[J].Journal of Geo-physical Research,1986,91(B6):6535-6545.
[6]何丽娟.辽河盆地新生代多期构造热演化模拟[J].地球物理学报,1999,42(1):62-68.He Lijuan.Mutiple tectono-thermal modeling of Liaohe Basin inthe Cenozoic[J].Chinese Journal of Geophysics,1999,42(1):62-68.
[7]Osborne M J,Swarbrick R E.Mechanisms for generating over-pressure in sedimentary basins:A reevaluation[J].AAPG Bulle-tin,1997,81(6):1023-1041.
[8]钻井手册(甲方)编写组.钻井手册(甲方)上册(M).北京:石油工业出版社,1990:43-86.Drilling Handbook(party A)Writing Group.Drilling handbook(party A):First volume[M].Beijing:Petroleum Industry Press,1990:43-86.
[9]王震亮,张立宽,施立志,等.塔里木盆地克拉2气田异常高压的成因分析及其定量评价[J].地质论评,2005,51(1):55-63.Wang Zhenliang,Zhang Likuan,Shi Lizhi,et al.Genesis analysisand quantitative evaluation on abnormal high fluid pressure inthe Kela-2gas field,Kuqa depression,Tarim Basin[J].GeologicalReview,2005,51(1):55-63.
[10]罗晓容.构造应力超压机制的定量分析[J].地球物理学报,2004,47(6):1086-1093.Luo Xiaorong.Quantitative analysis on overpressuring mecha-nism resulted from tectonic stress[J].Chinese Journal of Geo-physics,2004,47(6):1086-1093.
[11]石万忠,陈红汉,何生.库车坳陷构造挤压增压的定量评价及超压成因分析[J].石油学报,2007,28(6):59-65.Shi Wanzhong,Chen Honghan,He Sheng.Quantitative evalua-tion on contribution of structural compression to overpressureand analysis on origin of overpressure in Kuqa Depression[J].Acta Petrolei Sinica,2007,28(6):59-65.
[12]Luo X R,Vasseur G.Contributions of compaction and aquather-mal pressuring to geopressure and the influence of environmentalconditions[J].AAPG Bulletin,1992,76(10):1550-1559.
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