摘要
霸县凹陷沙河街组烃源岩生成的油气资源丰富,近几年是华北油田勘探的重点。但该区天然气资源潜力特别是成藏作用均不清楚。本文综合利用石油地质、地球化学和地球物理资料及前人研究成果,对霸县凹陷沙河街组烃源岩分布、演化及天然气生气潜力均作出了评价,同时对油气运聚成藏规律进行了系统研究。
霸县凹陷发育多套烃源岩,评价结果得出Es3中-下和Es4上烃源岩为主力烃源,霸县凹陷成熟-高熟油气资源丰富。霸县洼槽是成熟-高熟烃源灶的主要分布区,同时也是霸县凹陷的生烃中心。环霸县洼槽构造带油气均来自霸县洼槽:岔河集-高家堡地区低熟油气来自下伏Es3中-下烃源岩;二台阶地区油气源为牛东断层下降盘Es3烃源岩;文安斜坡油气主要来自洼槽内Es3烃源岩,斜坡外带混有Es1下烃源岩生成的油气。
环霸县洼槽不同构造带具有不同断裂和储盖组合特征。针对不同构造带分析其断裂特征及对油气成藏的作用,同时对储集层和储盖组合作出定量的评价。断层泥比率(SGR)是断层封闭性定量评价的有效参数:SGR>0.6封堵油藏,SGR>0.7封堵气藏;储盖层排替压力差(ΔPd)是储盖组合评价参数:ΔPd>3、2~3、1~2、<1分别为好、较好、中、差储盖组合;建立碳酸盐岩储层测井评价的标准。
对环霸县洼槽各个构造带典型油气藏进行解剖,分析其成藏主控因素,建立4种油气成藏模式:文安斜坡油气远距离运移差异聚集模式、二台阶早散失晚聚集油气成藏模式、深层断块潜山高成熟油气成藏模式和岔河集-高家堡滚动背斜低熟油气成藏模式。结合成藏模式和各构造带成藏条件指出环霸县洼槽潜山和洼槽区岩性圈闭是下一步勘探的有利区。环霸县洼槽潜山包括二台阶潜山、牛东断阶潜山和文安斜坡内带潜山。对牛东断阶潜山和文安斜坡内带潜山进行优选,分析了洼槽区岩性油气藏的勘探前景。
Source rock of Shahejie Formation in Baxian Depression generated abundant oil and gas, which is the key point of Huabei Oilfield’s exploration in recent years. But the natural gas resources potential, especially the accumulation effect are not clear in this area. In this thesis, we have studied the occurrence and evolution of Shahejie Formation’s source rock, we also evaluate the oil and gas generation ability, the migration and accumulation rules are studied systematically through the petroleum geology、geochemical and geophysical datas and the previous studies.
There are several positions of source rock in Baxian Depression. Through the results of our evaluation, we conclude that the middle and lower Es3 and upper Es4 are the main source rock, and the resource of mature gas and high-mature gas is very rich. Mature and high-mature source rock mainly distribute in Baxian sag where is the center of hydrocarbon generation. All gas and oil in structural belts that around the Baxian sag come from Baxian sag, low-mature gas of Chaheji-Gaojiabao region comes from the underlied middle and lower Es3’s source rock; the source of the low-lift region’s oil and gas is Es3 which belongs to the downthrow block of Niudong fault, hydrocarbon in Wenan slop comes from the source rock of Es3 that inner the sag, hydrocarbon of the upper slop mixs with the oil and gas that come from the lower Es1.
Different structural belts around the Baxian sag have different features of faults and associations of reservoir and cap. In view of different structural belts, we analyze the features of the faults and the affection to the accumulation of oil and gas, evaluate the reservoir and associations of reservoir and cap. We find that Shale Gouge Ratio(SGR) is a effective parameter for the evaluation of closure property of faults: SGR>0.6 sealing off the oil reservoir, SGR>0.7 sealing off the gas reservoir; the distinction of displacement pressure(ΔPd) of reservoir and cap:ΔPd>3、2~3、1~2、<1 are good、preferable moderate、bad associations of reservoir and cap respectively; establishing the standards of logging evaluation of carbonate reservoir.
Dissecting the typical oil and gas reservoirs on every structural belt around the Baxian sag, analyzing the main factors of accumulation of oil and gas, establishing 4 patterns of accumulation of oil and gas: the pattern of differential oil and gas accumulation lower and upper of the Wenan slope、the pattern of oil and gas lost early and accumulate later accumulation on low-lift、the pattern of high-mature oil and gas accumulation in deep block buried hill and the pattern of low-mature oil and gas accumulation in rolling anticline of Chaheji and Gaojiabao. Combining the patterns of accumulation and the conditions of accumulation in different structural belts, pointing out that the buried hill around the Baxian sag and the lithologic trap in the area of sag are the target areas of next exploration. The buried hill around the Baxian sag consist of low-lift buried hill、Niudong step-fault buried hill and buried hill inside of the Wenan slope. Optimising the Niudong step-fault buried hill and buried hill lower of the Wenan slope, analyzing the exploration prospectives of the lithologic hydrocarbon reservoir in the area of sag.
引文
[1]戴金星.近四十年来世界天然气工业发展的若干特征[J].天然气地球,1991,2(6):245-52.
[2]程克明.中国陆相油气生成[C].北京:石油工业出版社,1982,175-188.
[3]朱光有,金强,王锐.有效烃源岩识别方法[J].石油大学学报(自然科学版).2003,27(2):6-9.
[4]袁东山,王国斌,汤泽宁等.测井评价烃源岩方法及进展[J].石油天然气学报(江汉石油学院学报),2009,31(4):192-194.
[5] Whiticar, M.J., Correlation of natural gases with their sources. In:The Petroleum System from Source to Trap. Edited by Leslie B. Magoon and Wallance G. Don. AAPG Memoir 60:261-284.
[6]朱杨明.百色盆地原油成因类型及聚集特征[J].石油学报,2006,27(2):28-33.
[7]梅玲,张枝焕,王旭东等.渤海湾盆地南堡凹陷原油地球化学特征及油源对比[J].中国石油大学学报(自然科学版),2008,32(6):40-46.
[8]任拥军,邱隆伟,刘魁元等.渤海湾盆地车镇凹陷大王北洼陷原油类型及成因分析[J].石油实验地质,2007,29(5):495-499.
[9]付广.复合盖层在我国大中型油气田形成中的作用[J].新疆石油地质,1999,20(1);18-21.
[10]付广,付晓飞,孟庆芬.用声波时差研究泥岩盖层毛细管封闭能力[J].石油物探,2003,42(2):261-264.
[11]付广,陈章明,吕延防等.泥质岩盖层封盖性能综合评价方法探讨[J].石油实验地质,1998,20(1):80-84.
[12]邓祖佑,王少昌,姜正龙等.天然气封盖层的突破压力[J].石油与天然气地质,2000,21(2):136-138.
[13]赵新民,李国平,石强等.泥岩盖层纵向封闭性及砂岩储层侧向封堵性测井分析[J].2003,12(4):17-20.
[14]付广.油气封盖的主控因素及其作用分析.海洋石油[J],2003,23(3):29-31.
[15]付广,张发强,吕延防.厚度在泥岩盖层封盖油气中的作用[J].天然气地球科学,1998,9(6):20-25.
[16]吕延防.天然气扩散作用及其研究方法[M].北京:石油工业出社,1999,79-88.
[17]吕延防,付广,高大岭等.油气藏封盖研究[M].北京:石油工业出社,1996,4-30.
[18]付广,陈章明,吕延防.泥质岩盖层封盖性能综合评价方法探讨[J].石油实验地质,1998,20(1):80-86.
[19]卢双舫,李洪涛,付广.天然气富集的主控因素剖析[J].天然气工业,2003,23(6):7-11.
[20]陈永峤.断层封闭性要素与封闭效应[J].石油勘探与开发,2003,30(6):38-40.
[21]吕延防,付广等.断层封闭性研究[M].北京:石油工业出版社,2002.
[22]付广,杨勉.利用断裂填充物中的泥质含量研究断层封闭性的改进方法[J].江汉石油学院学报,2002,24(1):1-4.
[23]赵密福,李阳,李旭东等.泥岩涂抹定量研究[J].2005,26(1):60-64.
[24]张喜,王贵文等.断层垂向封闭演化及其研究意义[J].2007,26(4):51-54.
[25]戴俊生,李理等.油区构造解析[M].东营:石油大学出版社,2002
[26]陈刚,戴俊生等.生长指数与断层落差的对比研究[J].西南石油大学学报,2007,29(3):20-23.
[27]降栓奇.冀中北部天然气成因类型及成藏模式.西北大学硕士学位论文,2003.
[28]张以明,王余泉等.冀中坳陷复杂断块油藏成藏模式研究[J].石油地质,2006,10(2):14-20.
[29]梁宏斌,降栓奇,杨桂茹.冀中坳陷北部天然气类型及成藏模式及成藏条件研究[J].中国石油勘探,2003,7(1):17-33.
[30]方杰.天然气藏的封存条件研究—以冀中坳陷北部地区为例[J].天然气地球科学,2004,15(6):572-579.
[31]赵文智,窦立荣,宋岩等.我国天然气地质研究与勘探的新进展[J].天然气工业,2000,20(3):1~6.
[32]王建瑞.2007霸县凹陷石油与天然气地质综合评价及勘探目标优选(内部资料).
[33]杨明慧,刘池阳等.冀中坳陷的伸展构造系统及其构造背景[J].大地构造与成藏学2006,26(2):113-120.
[34]朱光有,金强.利用测井信息评价烃源岩的地球化学特征[J].地学前缘,2003,10(2).
[35]王贵文,朱振宇,朱广宇.烃源岩测井识别与评价方法研究[J].石油勘探与开发,2002,29(4):50-52.
[36]王力.柴达木盆地西部第三系烃源灶与油藏充注模式研究[D].东营:中国石油大学,2005.
[37]邬立言.生油岩热解快速定量评价[M].北京:科学出版社,1986:25-26.
[38]金强.有效烃源岩的重要性及其研究[J].油气地质与采收率,2001,8(1):1-4.
[39]吕延防,沙子萱,付晓飞等.断层垂向封闭性定量评价方法及其应用[J].石油学报,2007,28(5):34-38.
[40]杨智,何生,王芙蓉等.黏土涂抹充填方法评价断层封闭性研究[J].世界地质,2005,24(3):259-263.
[41]杨智,何生,王锦喜等.断层泥比率(SGR)及其在断层侧向封闭性评价中的应用[J].天然气地球科学,2005,16(3):347-351.
[42]赵密福,李阳等.断层两盘岩性配置关系及断层的封闭性[J].中国石油大学学报(自然科学版),2006,30(1):7-10.
[43]赵勇,戴俊生等.应用落差分析研究生成断层[J].石油勘探与开发,2003,30(3):13-15.
[44]谭增驹,刘洪亮,黄晓冬等.应用测井资料评价吐哈盆地盖层物性封闭[J].测井技术,2004,28(1):41-44.
[45]付广,付晓飞,孟庆芬等.用声波时差研究泥岩盖层毛细管封闭能力[J].石油物探,2003,42(2):261-264.
[46]邓祖佑,王少昌,姜正龙等.天然气封盖层的突破压力[J].石油与天然气地质,2000,21(2):136-138.
[47]华北油田勘探研究院.碳酸盐岩潜山油藏开发[M].石油工业出版社,1985.
[48]智慧文,杨志斌,肖兹等.塔河油田奥陶系碳酸盐岩储层孔隙度测井解释方法研究[J].新疆石油天然气,2007,3(4):5~9.
[49]卢颖忠,李保华,张宇晓等.测井综合特征参数在碳酸盐岩储层识别中的应用[J].中国西部油气地质,2006,2(1):109~113.
[50]梁苏娟,刘池阳,王定一.冀中坳陷下第三系构造背斜成因分类[J].西安工程学院学报,2002,24(1):25~28.