| 库车坳陷克深气田致密砂岩储层构造裂缝形成序列与分布规律 |
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| 引用本文： | 王珂,杨海军,李勇,张荣虎,杨学君,王俊鹏.库车坳陷克深气田致密砂岩储层构造裂缝形成序列与分布规律[J].大地构造与成矿学,2020(1):30-46. |
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| 作者姓名： | 王珂 杨海军 李勇 张荣虎 杨学君 王俊鹏 |
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| 作者单位： | 中国石油杭州地质研究院;中国石油勘探开发研究院塔里木盆地研究中心;中国石油塔里木油田公司 |
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| 基金项目： | 国家科技重大专项(2016ZX05001-002、2017ZX05001-002)资助 |
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| 摘 要： | 综合采用岩心、薄片和成像测井等资料,对库车坳陷克深气田白垩系巴什基奇克组构造裂缝的形成序列、分布规律和影响因素进行了研究。结果表明:剪切裂缝和张性裂缝在克深气田均有发育,以直立缝和高角度缝为主,主要形成于近南北向的挤压作用、背斜弯曲拱张作用和异常流体高压作用,微观裂缝切穿胶结物和部分颗粒,早期充填构造裂缝可在后期构造应力和异常流体高压作用下重新裂开成为有效裂缝。克深气田发育3期构造裂缝,其中第3期构造裂缝的形成时间与天然气大量充注期吻合,是工业规模性气藏形成的关键因素。单个断背斜高部位的构造应力低于背斜翼部,因此背斜高部位的构造裂缝线密度相对较低,但背斜弯曲变形使裂缝开度较大,有效性好,单井的无阻流量较高;翼部和断层附近构造裂缝线密度较大,但开度较小,有效性差;构造应力、岩石强度和变形时间的不同造成了构造裂缝特征在各气藏之间具有差异性。储层中部第3砂层组的构造裂缝发育程度中等,充填程度相对较低,并且平面上分布连续,可形成连片分布的储层“甜点”区,应成为克深气田开发中的重点层位。对克深气田构造裂缝起主要贡献作用的为水下分流河道和河口坝微相的粉?细砂岩。
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| 关 键 词： | 前陆冲断带 致密砂岩储层 构造裂缝 形成序列 分布规律 库车坳陷 |
Formation Sequence and Distribution of Structural Fractures in Compact Sandstone Reservoir of Keshen Gas Field in Kuqa Depression,Tarim Basin |
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| WANG Ke,YANG Haijun,LI Yong,ZHANG Ronghu,YANG Xuejun,WANG Junpeng.Formation Sequence and Distribution of Structural Fractures in Compact Sandstone Reservoir of Keshen Gas Field in Kuqa Depression,Tarim Basin[J].Geotectonica et Metallogenia,2020(1):30-46. |
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| Authors: | WANG Ke YANG Haijun LI Yong ZHANG Ronghu YANG Xuejun WANG Junpeng |
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| Institution: | (PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,Zhejiang,China;Tarim Basin Research Center,PetroChina Research Institute of Petroleum Exploration&Development,Korla 841000,Xinjiang,China;PetroChina Tarim Oilfield Company,Korla 841000,Xinjiang,China) |
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| Abstract: | The characteristics,formation sequence,and distribution of structural fractures in the Lower Cretaceous Bashijiqike Formation(K1bs)of the Keshen gas field,as well as factors controlling their formation,were investigated based on the core,thin sections and image logging.The results showed that both shearing fractures and tensile fractures,which are mainly vertical and high angle fractures,were developed in the Keshen gas field.The fractures were primarily formed by NS compressive stress,folding effect of anticline,and abnormal high fluid pressure.And microfractures cut through cements and particles are common.The early structural fractures filled with cements can re-crack to be effective fractures by the late tectonic stress and abnormal high fluid pressure.There are three periods of structural fractures in the Keshen gas field.The 3rd fracture synchronizes with the massive accumulation of natural gas,which is the key factor controlling the formation of the industrial natural gas reservoir.Tectonic stress is relatively lower at the top of the anticline than the limbs,and therefore,the top of the anticline has lower fracture linear density than the limbs,which may account for the higher fracture aperture and validity of fracture,and consequently,the higher open-flow capacity at the top part of individual faulted anticline gas pool as was revealed by drilling wells.On the contrary,the limbs and fault vicinity have higher fracture linear density but lower aperture,and thus,lower validity.The different tectonic stress,rock strength and deformation time may result in different structural fractures in individual gas pools.The structural fractures in the 3rd sand layer group are moderately developed which are characterized by lower filling and continuous distribution on the plane,and therefore,are“sweet spot”for continuous reservoir.Siltstone and fine-grained sandstone occur as micro-facies of underwater interdistributary channels and estuary dams might have played important roles in the development of structural fractures in the Keshen gas field. |
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| Keywords: | foreland thrust belt compact sandstone reservoir structural fracture formation sequence distribution Kuqa Depression |
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