苏西48区盒8段气水分布规律
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摘要
苏西盒8段气藏是一个低压、低渗透、低丰度、大面积分布的岩性气藏,勘探开发资料表明储层段岩性复杂,非均质性强,因此准确识别气水层、正确认识气水分布规律成为制约气田开发的关键技术问题。本文在前人苏西盒8气藏研究成果的基础上,结合研究区钻井、测井和水质分析资料,对苏西48区储层物性、砂体展布、测井解释、生产动态特征和全区不同水类的离子化学特征的综合研究,取得了如下成果与认识:
1、依据测井解释成果、试气生产数据、注入和返排量结合对水质分析资料,将苏西产水类型划分为正常地层水、凝析水、淡化地层水、残液四类;研究认为该地区成藏保存条件良好。
2、利用岩心、薄片资料分析了盒8段的物性特征,并结合测井资料科学有效的识别了盒8岩性,建立了砂泥岩电性识别标准,分析了砂体的剖面、平面展布规律,并进一步识别了砂岩类型,加深了对储集层认识。
3、采用多种方法研究不同产层流体测井响应特征并对全区单井储层流体进行了有效识别,筛选出了流体判别的一些较好方法;结果表明,盒8下1段是气藏主力产层,推荐使用以孔隙度-电阻率为主,地层水孔隙度法、多元判别分析和视地层水电阻率法为辅助进行苏西48区盒8段流体识别。
4、分析了全区39口试产井的试气资料和全区不同水类的离子化学特征,总结了三类投产井出水机理,即局部边底水、透镜状水、致密地层水;结合砂体分布、砂顶微构造、气水剖面剖析了研究区气水空间分布特征,指出气藏不存在统一的气水界面,进而对气水分布区作出了预测;最后总结了研究区的三类气水分布模式。
He 8 of the west area of Sulige Gas field is a lithologic gas reservoir with low pressure、low permeability and low reserve abundance and large area distribution. Exploration and Development data show that the reservoir has strong heterogeneity and lithology is complex. Therefore, accurate identification of gas and water layer and the correct understanding of gas and water’s distribution as the key technology which constraint to the development field. Based on the studies of former researchers on this area,combining drilling data、log interpretation and data of water quality analysis of the research area, a comprehensive research on reservoir physical property、distribution of sand bodies、log interpretation、production performance character and ions chemical characteristics of different kinds of water on the whole research area, achieve some results and cognitions such as :
1、Basis for well logging interpretation、gas production test production data、injection and flow back amount combing water quality analysis data, water production type of the west of Sulige is divided into normal formation water、condensate water、ontzilte formation water、raffinate;In this study we consider that reservoir formation preservation conditions is good in this region.
2、Use core thin section data to analyze physical properties characteristics , combing logging data scientific and effectivly discriminated lithology Of He 8,establish identification standards of electrical property of sand-mud stone,analyzed profile、planar distribution law of sand body,and furtherly discriminated sandstone type, and it have deepened our knowledge of reservoir.
3、Use various methods to study on fluid log response characteristics of different producing formation , make effectively recognition about reservoir fluid of single well of the whole region, select some good methods to discriminant fluid; the results showed that, He 8 lower 1 is the main production layer of gas reservoir, recommend porosity/resistivity as t main method, formation water porosity、multivariate discriminant analysis and apparent water resiscivity technique as auxiliary method to recognit fluid of He 8 of the west of sue league 48 area;
4、Analyze production performance of 39 wells and ions chemical characteristics of various water in the whole region, summarize three kinds of water breakthrough of commissioning well, that are relative centralized water、lenticular water、compact formation water; Analyze gas/water spatial distribution of the study area combining sand distribution、top of sand body structure and gas/water profile, obtain that there is no unified gas/water interface of gas reservoir, then make a prediction about the gas/water distribution area. At last, the paper generalizes three gas/water distribution patterns.
1、依据测井解释成果、试气生产数据、注入和返排量结合对水质分析资料,将苏西产水类型划分为正常地层水、凝析水、淡化地层水、残液四类;研究认为该地区成藏保存条件良好。
2、利用岩心、薄片资料分析了盒8段的物性特征,并结合测井资料科学有效的识别了盒8岩性,建立了砂泥岩电性识别标准,分析了砂体的剖面、平面展布规律,并进一步识别了砂岩类型,加深了对储集层认识。
3、采用多种方法研究不同产层流体测井响应特征并对全区单井储层流体进行了有效识别,筛选出了流体判别的一些较好方法;结果表明,盒8下1段是气藏主力产层,推荐使用以孔隙度-电阻率为主,地层水孔隙度法、多元判别分析和视地层水电阻率法为辅助进行苏西48区盒8段流体识别。
4、分析了全区39口试产井的试气资料和全区不同水类的离子化学特征,总结了三类投产井出水机理,即局部边底水、透镜状水、致密地层水;结合砂体分布、砂顶微构造、气水剖面剖析了研究区气水空间分布特征,指出气藏不存在统一的气水界面,进而对气水分布区作出了预测;最后总结了研究区的三类气水分布模式。
He 8 of the west area of Sulige Gas field is a lithologic gas reservoir with low pressure、low permeability and low reserve abundance and large area distribution. Exploration and Development data show that the reservoir has strong heterogeneity and lithology is complex. Therefore, accurate identification of gas and water layer and the correct understanding of gas and water’s distribution as the key technology which constraint to the development field. Based on the studies of former researchers on this area,combining drilling data、log interpretation and data of water quality analysis of the research area, a comprehensive research on reservoir physical property、distribution of sand bodies、log interpretation、production performance character and ions chemical characteristics of different kinds of water on the whole research area, achieve some results and cognitions such as :
1、Basis for well logging interpretation、gas production test production data、injection and flow back amount combing water quality analysis data, water production type of the west of Sulige is divided into normal formation water、condensate water、ontzilte formation water、raffinate;In this study we consider that reservoir formation preservation conditions is good in this region.
2、Use core thin section data to analyze physical properties characteristics , combing logging data scientific and effectivly discriminated lithology Of He 8,establish identification standards of electrical property of sand-mud stone,analyzed profile、planar distribution law of sand body,and furtherly discriminated sandstone type, and it have deepened our knowledge of reservoir.
3、Use various methods to study on fluid log response characteristics of different producing formation , make effectively recognition about reservoir fluid of single well of the whole region, select some good methods to discriminant fluid; the results showed that, He 8 lower 1 is the main production layer of gas reservoir, recommend porosity/resistivity as t main method, formation water porosity、multivariate discriminant analysis and apparent water resiscivity technique as auxiliary method to recognit fluid of He 8 of the west of sue league 48 area;
4、Analyze production performance of 39 wells and ions chemical characteristics of various water in the whole region, summarize three kinds of water breakthrough of commissioning well, that are relative centralized water、lenticular water、compact formation water; Analyze gas/water spatial distribution of the study area combining sand distribution、top of sand body structure and gas/water profile, obtain that there is no unified gas/water interface of gas reservoir, then make a prediction about the gas/water distribution area. At last, the paper generalizes three gas/water distribution patterns.
引文
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[5]张文昭.鄂尔多斯盆地油气勘探的重大突破.中国矿业,1999,8(3):5～8.
[5]张士亚.鄂尔多斯盆地天然气气源及勘探方向.天然气工业,1994,14(3):1～4.
[7]何东博.苏里格气田复杂储层控制因素和有效储层预测[D].北京.中国地质大学博士学位论文,2005,5.
[8]李文权,王瑞华.苏10区块气层识别技术及勘探开发潜力分析[J].特种油气藏,2006,13(6): 39-42. [9 ]刘方魁等编著.油气田水文地质学原理[M].北京:石油工业出版社,1991.
[10] Collins A G.1975.Geochemistry of oilfield waters, chap.1, New York:W.H. Freeman and Company,267-269.
[11]高锡兴.中国含油气盆地油田水[M].北京:石油工业出版社,1994.
[12]刘崇禧.我国陆相盆地油田水文地球化学特征[J].地球化学,1982,11(2):190-197.
[13]杨忠辉等.油气田的水文地球化学标志及其应用[J].石油天然气地质,1982,3(4):327-334.
[14]张金来.我国油田水的基本特征及其分类讨论[J].地质论评,1979(2):64-69.
[15]张金来.中国东部中、新生代陆相广盆与槽盆油田水化学场比较[J].石油与天然气地质,1983,4(2):222-228.
[16]汪义先.泌阳凹陷油田水地球化学特征及其与油气的关系[J].石油实验地质,1983,5(4):298-303.
[17]李贤庆等.鄂尔多斯盆地中部气田地层流体特征与天然气成藏[M].北京:地质出版社,1997.
[18]汪蕴璞,林锦璇等.论含油气盆地含水系统和水文地质期的划分[J].地球科学,1995,20(4):393-398.
[19]楼章华,金爱民等.海相地下水文地球化学与油气保存条件评价[J].浙江大学学报(工学版),2006,40(3):501-505.
[20]周风鸣,马越蛟,王峰轩.冀东油田低电阻率油层测井解释方法研究,油田开发技术一冀东油田论文集,1999,北京:石油工业出版社.
[21]周灿灿,梁晶,李属殉等.柳东储层含油饱和度测井解释模型,油田开发技术一冀东油田科技论文集,石油工业出版社,2000.
[22]李亚林,雷晓等.用神经网络方法识别碳酸盐裂缝系统中的气与水[J].天然气工业,2000,20(1):32-36.
[23]周明顺等.华北油田冀中坳陷低电阻油气层测井识别技术应用研究,2002,内部报告.
[24]史松群,赵玉华.苏里格气田低阻砂岩储层的含气性预测研究,2003.
[25]高云峰等.美国Hartzog Draw气田Shannon储层AVO异常地质属性分析.天然气工业,2000,20(4).
[26] Carcione J M.Amplitude variations with offset of pr-essure-seal reflections. Geophysics,2001,66(1):283~293.
[27] Carcione J M and Umberta T. Bottom-simulatingreflectors: seismic velocities and AVO effects.Geophysics,2000,65(1):54~67.
[28] Carcione J M.Effects of vector attenuation on AVO of offshore reflections. Geophysics,1999,64(3).
[29] Castagna J P and Swan H W.Framework for AVOgradient and intercept interpretation. Geophysics,1998,63(3): 948~956.
[30] Castagna J P and Swan H W.Principles of AVO cr-ossplotting.The Leading Edge, 1997(4):337~342.
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