基于断层封闭性机理及其影响因素研究,在考虑断层承压时间的情况下对断层封闭性定量评价的断-储排替压力差法进行改进,建立了考虑时间因素的断层封闭性定量评价地质与数学模型。采用给定步长、逐渐逼近的算法,确定围岩地层岩石具有与靶点断层岩相同泥质含量和成岩程度的埋深,再根据研究区所建立的岩石泥质含量和埋藏深度乘积与排替压力的关系,定量计算出靶点断层岩的排替压力,用目的盘储集层排替压力与之比较,定量评价断层的封闭与否及封闭能力的大小。通过歧口凹陷板桥断层圈闭油气藏的实际资料的验证,以及与断层岩的泥质含量（SGR）法和未考虑承压时间的断-储排替压力差评价断层封闭性方法的比较,证实该方法具有更好的可行性和更高的可信度。图5表1参18
The fault-reservoir displacement pressure differential method, as a quantitative evaluation method of fault sealing which considering diagenetic time of fault rock, was improved based on the study of fault sealing mechanism and its influencing factors. A geology and mathematical model of quantitative evaluation of fault sealing considering diagenetic time was established. First, the depth of surrounding rock which has the same shale content and diagenetic degree as the fault rocks at the target was determined using the method of successive approximation at the given step length. Second, the displacement pressure of target fault rocks was calculated based on the relationship between the displacement pressure and the product of shale content and burial depth that was established for the study area. And third, the sealing states and capacity of the faults were quantitatively evaluated by comparing the calculated displacement pressure with that of the target reservoir. By the actual data of reservoirs at Banqiao fault in Qikou sag and the result comparison between fault rock shale content method (SGR) and fault-reservoir displacement pressure differential method without considering the bearing time, it is verified that this method is more feasible and credible.
[1] 吕延防, 王帅. 断层封闭性定量评价[J]. 大庆石油学院学报, 2010, 34(5): 35-41.
LYU Yanfang, WANG Shuai. Quantitative evaluation of fault seal[J]. Journal of Daqing Petroleum Institute, 2010, 34(5): 35-41.
[2] 吴孔友, 李继岩, 崔世凌, 等. 断层成岩封闭及其应用[J]. 地质力学学报, 2011, 17(4): 350-360.
WU Kongyou, LI Jiyan, CUI Shiling, et al. Diagenetic sealing characteristics of faulting zone and its application[J]. Journal of Geomechanics, 2011, 17(4): 350-360.
[3] 付晓飞, 许鹏, 魏长柱, 等. 张性断裂带内部结构特征及油气运移和保存研究[J]. 地学前缘, 2012, 19(6): 200-212.
FU Xiaofei, XU Peng, WEI Changzhu, et al. Internal structure of normal fault zone and hydrocarbon migration and conservation[J]. Earth Science Frontiers, 2012, 19(6): 200-212.
[4] CHILDS C, MANZOCCHI T, WALSH J J, et al. A geometric model of fault zone and fault rock thickness variations[J]. Journal of Structural Geology, 2009, 31: 117-127.
[5] SCHMATZA J, VROLIJK P J, URAI J L. Clay smear in normal fault zones: The effect of multilayers and clay cementation in water-saturated model experiments[J]. Journal of Structural Geology, 2010, 32: 1834-1849.
[6] LINDSAY N G, MURPHY F C, WALSH J J, et al. Outcrop studies of shale smears on fault surfaces[M]. Alger: International Association of Sedimentologists Special Publication, 1993: 113-123.
[7] FULLJAMES J R, ZIJERVELD L, FRANSSEN R. Fault seal processes: Systematic analysis of fault seals over geological and production time scales[C]//MOLLER-PEDERSON P, KOESTLER A G. Hydrocarbon seals: Importance for exploration and production. London: Geological Society Special Publication, 1997: 51-59.
[8] FRISTAD T, GROTH A, YIELDING G, et al. Quantitative fault seal prediction: A case study from Oseberg Syd[C]//MOLLER PEDERSEN P, DOESTLER A G. Hydrocarbon seals: Importance for exploration and production. London: Geological Society Special Publication, 1997: 107-124.
[9] YIELDING G, FREEMAN B, NEEDHAM D T. Quantitative fault seal prediction[J]. AAPG Bulletin, 1997, 81(6): 897-917.
[10] BRETAN P, YIELDING G, JONES H. Using calibrated shale gouge ration to estimate hydrocarbon column heights[J]. AAPG Bulletin, 2003, 87(3): 397-413.
[11] 吕延防, 黄劲松, 付广, 等. 砂泥岩薄互层段中断层封闭性的定量研究[J]. 石油学报, 2009, 30(6): 824-829.
LYU Yanfang, HUANG Jinsong, FU Guang, et al. Quantitative study on fault sealing ability in sandstone and mudstone thin interbed[J]. Acta Petrolei Sinica, 2009, 30(6): 824-829.
[12] 付广, 王浩然, 胡欣蕾. 断层垂向封闭的断-储排替压力差法及其应用[J]. 石油学报, 2014, 35(4): 687-691.
FU Guang, WANG Haoran, HU Xinlei. Modification and application of fault-reservoir displacement pressure differential method for vertical sealing of faults[J]. Acta Petrolei Sinica, 2014, 35(4): 687-691.
[13] SMITH D A. Sealing and nonsealing faults in Louisiana Gulf Coast salt basin[J]. AAPG Bulletin, 1980, 64(2): 145-172.
[14] 陈发景, 田世澄. 压实与油气运移[M]. 武汉: 中国地质大学出版社, 1989: 136-163.
CHEN Fajing, TIAN Shicheng. Compaction and migration of oil and gas[M]. Wuhan: China University of Geosciences Press, 1989: 136-163.
[15] 史集建, 李丽丽, 付广, 等. 盖层内断层垂向封闭性定量评价方法及应用[J]. 吉林大学学报(地球科学版), 2012, 42(增刊2): 162-170.
SHI Jijian, LI Lili, FU Guang, et al. Quantitative evaluation method and application of vertical sealing property of faults in caprock[J]. Journal of Jilin University (Earth Science Edition), 2012, 42(Supp.2): 162-170.
[16] 吴国平, 苏江玉, 成实, 等. 基于自然伽马测井信号的维纳滤波法求取泥质含量[J]. 地球科学(中国地质大学学报), 2008, 33(4): 572-576.
WU Guoping, SU Jiangyu, CHENG Shi, et al. A method for obtaining shaliness using Wiener filtering based on logging data natural Gamma ray[J]. Earth Science (Journal of China University of Geosciences), 2008, 33(4): 572-576.
[17] 黄传炎, 王华, 吴永平, 等. 歧口凹陷第三系层序格架下的油气藏富集规律[J]. 吉林大学学报(地球科学版), 2010, 4(5): 986-994.
HUANG Chuanyan, WANG Hua, WU Yongping, et al. Analysis of the hydrocarbon enrichment regularity in the sequence stratigraphic framework of Tertiary in Qikou Sag[J]. Journal of Jilin University (Earth Science Edition), 2010, 4(5): 986-994.
[18] 石世革. 黄骅坳陷板桥凹陷古近系沙一段中部层序地层学研究与岩性油气藏勘探[J]. 石油与天然气地质, 2008, 29(3): 320-325.
SHI Shige. Study of sequence stratigraphy and exploration of lithologic reservoirs in the Paleogene middle Sha-1 member, the Banqiao Sag of the Huanghua Depression[J]. Oil & Gas Geology, 2008, 29(3): 320-325.
