石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (5): 1004-1016.doi: 10.11743/ogg20200511
张凤奇1,2(), 鲁雪松3, 卓勤功3, 钟红利4, 张佩1, 魏驰1, 刘伟1
收稿日期:
2018-07-10
出版日期:
2020-10-28
发布日期:
2020-10-22
作者简介:
张凤奇(1981-),男,博士、副教授,油气成藏动力学和油气形成机制。E-mail:基金资助:
Fengqi Zhang1,2(), Xuesong Lu3, Qingong Zhuo3, Hongli Zhong4, Pei Zhang1, Chi Wei1, Wei Liu1
Received:
2018-07-10
Online:
2020-10-28
Published:
2020-10-22
摘要:
准噶尔盆地南缘喜马拉雅晚期构造挤压强烈,导致其下组合储层超压的形成和演化过程复杂。综合地层压力和实际地质资料,探讨了准噶尔盆地南缘下组合超压的测井响应特征和砂岩、泥岩的综合压实特征;结合改进的超压识别图版和声发射测定的古应力等,确认了研究区下组合储层超压的主要形成机制;结合构造应力和垂向载荷双重压实作用的数值模拟,定量分析了各超压形成机制的演化特征和对现今超压形成的贡献。结果表明,构造挤压作用是研究区下组合储层超压形成的最主要成因,其次为垂向上的不均衡压实作用及沿断裂的垂向和沿砂体的侧向超压传递作用。古近纪以来到塔西河期,垂向上的不均衡压实作用在研究区部分地区开始形成,该增压作用对四棵树凹陷东部和第三排构造带东部深层下组合齐古组强超压形成的贡献分别为1.4%和33.3%;塔西河末期以来,持续的强烈构造挤压作用引起了研究区下组合储层压力快速增加,该增压作用对四棵树凹陷东部和第三排构造带东部下组合齐古组强超压形成的贡献分别为65.8%和50.8%;独山子末期以来特别是第四纪,背斜的形成和断裂的开启引起下组合深层储层形成了快速的超压传递增压,该增压作用对四棵树凹陷东部和第三排构造带东部下组合齐古组强超压形成的贡献分别为32.8%和15.9%。
中图分类号:
表1
准噶尔盆地南缘典型井声发射测试结果"
井号 | 层位 | 埋深/m | 水平最大主应力(σH)/MPa | 垂向载荷应力(σV)/MPa | 两者应力对比 | 两者应力差值/MPa |
Q009 | J2x | 677.78 | 62.16 | 16.27 | σH>σV | 45.90 |
Fc1 | K1q | 5 784.50 | 126.99 | 138.89 | σH < σV | -11.90 |
Sc1 | J2x | 4 188.70 | 95.62 | 100.57 | σH < σV | -5.00 |
Ds1 | J3q | 6 417.90 | 254.51 | 155.60 | σH>σV | 98.90 |
Q1 | J2x | 2 653.50 | 126.78 | 63.71 | σH>σV | 63.10 |
H001 | E2-3a | 3 180.00 | 115.52 | 77.39 | σH>σV | 38.13 |
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