| 基于CT成像技术的白云岩储层微观表征 |
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| 引用本文： | 田兴旺,杨岱林,钟佳倚,孙奕婷,王云龙,杨雨,文龙,张玺华,彭瀚霖,何家欢,蒲治锦,马奎.基于CT成像技术的白云岩储层微观表征[J].沉积学报,2021,39(5):1264-1274. |
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| 作者姓名： | 田兴旺 杨岱林 钟佳倚 孙奕婷 王云龙 杨雨 文龙 张玺华 彭瀚霖 何家欢 蒲治锦 马奎 |
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| 作者单位： | 中国石油西南油气田分公司勘探开发研究院，成都 610041 |
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| 基金项目： | 国家重点研发计划2017YFC0603106国家科技重大专项2016ZX05004-005, 2017ZX05008-005-003中国石油西南油气田分公司科技处项目20190301-10 |
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| 摘 要： | 震旦系灯影组四段是四川盆地安岳气田主力勘探产层之一，是一套受丘滩体发育和桐湾II幕表生岩溶作用共同控制的储层。灯四段储层纵横向非均质性强，相较于台缘带灯四段孔洞型优质储层连续发育的特征，台内区丘滩相沉积不足、岩溶作用效果变差，储层厚度减薄，品质降低，常规手段在对此类储层性质的研究上具有一定的局限性。为此，应用X射线CT扫描成像与数字岩心技术，以川中磨溪—龙女寺台内地区震旦系灯影组四段白云岩岩溶储层为例，将储集空间分为孔隙和喉道，从定性和定量的角度进行储层系统表征。结果表明:研究区储层溶蚀孔隙、溶蚀孔洞、裂缝相间发育，裂缝切割相邻孔洞对提高储层连通性具有重要作用。孔喉相互位置关系以及孔喉半径、长度、体积等参数共同决定了储层品质，孔隙发育数量及孔径分布特征决定储集空间大小，喉道发育数量、喉道半径、单喉道长度分布情况影响储层中孔隙沟通能力即决定了储层有效性。磨溪东—龙女寺台内区裂缝发育区孔洞型储集空间是台内优质储层关键勘探目标。
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| 关 键 词： | 磨溪—龙女寺地区 CT成像技术 震旦系 孔隙 喉道 |
| 收稿时间： | 2020-03-23 |
Microscopic Characterization of Dolomite Reservoirs by CT Imaging:A case study of the Dengsi Formation in Moxi-Longnvsi area,central Sichuan |
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| TIAN XingWang,YANG DaiLin,ZHONG JiaYi,SUN YiTing,WANG YunLong,YANG Yu,WEN Long,ZHANG XiHua,PENG HanLin,HE JiaHuan,PU ZhiJin,MA Kui.Microscopic Characterization of Dolomite Reservoirs by CT Imaging:A case study of the Dengsi Formation in Moxi-Longnvsi area,central Sichuan[J].Acta Sedimentologica Sinica,2021,39(5):1264-1274. |
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| Authors: | TIAN XingWang YANG DaiLin ZHONG JiaYi SUN YiTing WANG YunLong YANG Yu WEN Long ZHANG XiHua PENG HanLin HE JiaHuan PU ZhiJin MA Kui |
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| Institution: | Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China |
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| Abstract: | The Dengying Formation of the Sinian system is currently one of the main exploration and production layers in the Sichuan Basin. It comprises a set of reservoirs controlled by bioherm beach and karstification following the Tongwan Episode II movement. The reservoir of the Dengying Formation is highly heterogeneous vertically and horizontally. Compared with the characteristics of continuous development of high-quality hole-type reservoirs at the platform margin， intra-platform bioherm beach facies deposition is insufficient. The karst effect is less， reservoir thickness reduces， quality decreases， and it is mainly composed of thin-hole-type reservoirs developed at the top of the fourth member of the Dengying Formation. A Routine techniques have some limitations in examining the properties of such reservoirs. For this reason， X-ray CT scan imaging and digital core technology were used in this study. For example， in the carbonates of the Sinian Dengying Formation in Moxi-Longnvsi area in central Sichuan， the technique divides reservoirs into pore space and throat space， and characterizes the reservoir system qualitatively and quantitatively. The results show that the dissolved cavities， dissolved pores and developed fissures are interphase， and the adjacent pores that are cut by fissures play an important role in improving reservoir connectivity. The reservoir properties are controlled by parameters such as the mutual position， radius and volume of pores and throats. The extent of pore development and pore size distribution determines the size of reservoir space. The number of throat developments， throat radius and the distribution of individual throat lengths affect interpore connectivity and fluid migration ability， thus determining the effectiveness of the reservoir. The hole-type reservoir space in the fissure development zone in the Moxi-Longnvsi intraplatform is a key exploration target for high-quality intraplatform reservoirs. |
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