使用纳米碳酸钙降低低孔低渗煤层气储层伤害          下载免费PDF全文

谷穗  蔡记华  常德武  维克多·费多罗维奇·契霍特金 《地球科学》2015,40(6):1093-1100

传统暂堵剂难以封堵低孔低渗煤层气储层中的大量纳米级别孔隙.通过煤岩显微观测、钻井液基本性能测试、泥饼清除实验、煤岩孔隙分布实验和气体渗透率实验,探讨了纳米碳酸钙降低低孔低渗煤层气储层伤害的效果.结果表明:纳米碳酸钙材料只有在水溶液中保持纳米级的分散状态,才可能对低渗煤岩起到暂堵作用;基于纳米碳酸钙的可降解钻井液既能封堵低孔低渗煤岩中微米级别孔隙,也能封堵其中的纳米级别孔隙;经过生物酶和稀盐酸双重解堵后,煤岩渗透率恢复值达77.17%~97.98%,储层保护效果好;煤岩孔隙分布实验可以在纳米尺度上研究纳米材料对低孔低渗储层的暂堵效果.研究成果可为纳米碳酸钙在低孔低渗煤层和页岩钻完井过程中的应用奠定良好技术基础.   相似文献   

Methane Oxidation in the Water Column of Xiangxi Bay,Three Gorges Reservoir     

Dan Lei  Jia Liu  Junwei Zhang  Andreas Lorke  Shangbin Xiao  Yuchun Wang  Wei Wang  Ye Li 《洁净——土壤、空气、水》2019,47(9)

Four field campaigns are carried out to quantify the methane (CH₄) oxidation rate in Xiangxi Bay (XXB) of the Three Gorges Reservoir (TGR), China. The water depth of the sampling site varied from 13 to 30 m resulting from the water level fluctuation of the TGR. The CH₄ oxidation rates are measured in situ as the decline of dissolved CH₄ concentration versus time in incubated, and those rates. The CH₄ oxidation rates range from 1.18 × 10^?3 to 3.69 × 10^?3 µmol L^?1 h^?1, with higher values and stronger variation during summer. A static floating chamber method is used to measure CH₄ emitted to the atmosphere resulting in an annual mean flux of 4.79 µmol m^?2 h^?1. The CH₄ emission rate is significantly negatively correlated with the water level. The results show that a large fraction of CH₄ is consumed in the water column with a range of 28.97–55.90 µmol m^?2 h^?1, accounting for ≈69–98% of the total CH₄ input into the water column, and more than 90% is consumed outside the summer, when the water level is lowest. Water depth, which is dominated by water level of the TGR, is a potentially important driver for CH₄ oxidation and atmospheric emission in the tributary bay.  相似文献   

塔河油田奥陶系储层构造应力场研究     

刘佳庚  李静  苏玉亮  范作松  刘旭亮  郭豪 《地质力学学报》2020,26(1):48-54

油气储层构造应力场的分布特征，对油气运移、注采井网布置、储层改造等具有重要意义。为此，文章从塔河油田AD13井区的地质构造演化入手，基于油田测井资料，结合弹性力学及有限元理论，建立研究区地应力弹性力学计算模型，利用有限元软件对研究区储层地应力进行模拟研究，并将模拟结果与现场地应力实测值进行对比分析。结果表明，研究区最大水平主应力为102~130 MPa，最小水平主应力为87~110 MPa，均为压应力；研究区东部及南部最大水平主应力方向为北东向，西北部最大水平主应力方向为北东东向，西南部最大水平主应力方向为南东向，地应力大小及方向均与实际结果相符。研究结果可为研究区油气勘探开发工程提供科学依据。   相似文献   

HD-1注汽井新型防砂材料的研究与应用     

沈朝霞  梁富春  高成元  刁俊西  孙理达 《海洋地质译丛》2010,(3):61-63

孤岛油田属稠油疏松砂岩油藏,生产过程中油井出砂严重,现有的涂敷砂人工井壁防砂注蒸汽后强度较低,造成防砂成功率低,注汽后高强度采液生产周期较短。为此,通过室内试验,优选出耐高温树脂、高强度骨架颗粒、偶联剂、固化剂,进行室内配方优化试验,评价固结体耐高温性能,测定其渗透率,研制出一种适用于疏松砂岩油藏注蒸汽热采井的HD-1注汽井新型防砂材料。在孤岛油田稠油注蒸汽热采区共试验72口井,成功率为91.0%,截止目前,累计产油为121 572 t,单井平均有效期为233 d。现场应用表明：HD-1注汽井新型防砂材料耐高温、强度高,防砂成功率高,有效期长,能够有效改善注蒸汽热采井的防砂效果。  相似文献   

鄂尔多斯盆地镇北地区长3储层微观非均质性的实验分析   总被引：10，自引：0，他引：10  

刘林玉  张龙  王震亮  高潮 《沉积学报》2007,25(2):224-229

油气储层的微观非均质性特征是储层地质学研究的重要内容之一。本文的目的是研究鄂尔多斯盆地镇北地区长3储层微观非均质性特征,研究方法是利用真实砂岩微观模型实验。通过实验发现鄂尔多斯盆地镇北地区长3和储层为致密型砂岩,真实砂岩微观模型实验直观地显示出鄂尔多斯盆地镇北地区长3储层具有很强的微观非均质性,砂岩的成岩作用和孔隙结构是影响本区长3储层微观非均质性的主要原因。在低渗透砂岩中,溶蚀作用引起砂岩产生强烈的非均质性,而这些砂岩则形成长3储层的高渗带。  相似文献   

Possible impact of dam reservoirs and river diversions on material fluxes to the Gulf of Thailand   总被引：1，自引：0，他引：1  

Manuwadi Hungspreugs  Wilaiwan Utoomprurkporn  Penjai Sompongchaiyakul  Watanee Heungraksa 《Marine Chemistry》2002,79(3-4)

Thai people have always been agricultural-based, although rainwater is not enough to sustain year-round agricultural practice. The first earth-filled dam was built across a valley near Sukhothai over 700 years ago. Now, there are six major multipurposed dam reservoirs, among which the largest is the Sri Nakarind (SN) built across the Kwae Yai River, the main branch of the Mae Klong River in the western part of Thailand. The first multipurposed dam reservoir built on the Chao Phraya (largest) River System is the Bhumibhol Dam on the Ping River. In this paper, the two Mae Klong River Dam Reservoirs and their biology and chemistry are discussed. Also investigated are the historical records of material fluxes to the Gulf of Thailand in down-core sediment profiles and in 40-year bands of coral, Porites lutea, taken from the Upper Gulf of Thailand near Si Chang Island. Sediment cores studied did not show clear decreases in the biogenic silica concentration in the Upper Gulf area after the building of dams. Part of the reasons might be the higher rate of dissolution of silica in tropical waters bioturbation of surface layers or the constant disturbance of the bottom sediment by fishermen using bottom trawls. The record in the coral bands seems to be more promising in reflecting the material flux change due to dam construction. An attempt to detect changes in diatom population with time due to the expected decrease in siliceous material discharge was not possible because there was a change from the use of 70 μm mesh size to 20 μm mesh size resulting in the increase of species and biomass, although the diatom percentage remained above 80% in all estuarine samples.  相似文献   

柴西地区扎哈泉致密油储层特征及评价     

吴颜雄  薛建勤  杨智  施奇  李海鹏  刘刚  夏晓敏 《世界地质》2018,37(4):1167-1176

柴西地区致密油储层内部结构复杂、非均质性强,为了更高效地进行致密油勘探开发,利用岩芯薄片、X衍射、场发射扫描电镜、CT扫描和物性分析等方法,对扎哈泉地区上干柴沟组开展致密储层特征及储层物性控制因素研究。研究表明,上干柴沟组为典型的致密储层,以细砂岩和粉砂岩为主,填隙物含量较高,以原生孔隙为主,微米级孔隙是主要的储集空间,有效储层平均孔隙度为5. 9%,平均渗透率为0. 43 m D。储层内部孔隙分布较均匀,总体呈现微米级孔隙加纳米级喉道的特征,其中微米级孔隙基本呈片状分布,连通性好,纳米级孔隙则呈点孤立状分布。储层物性受原始沉积条件和后期成岩作用控制,坝砂泥质含量低,纯度高,物性较好。压实作用和碳酸盐胶结使储层变差,硬石膏胶结对孔隙的影响具有两面性,晚成岩期的溶蚀作用对储层改善作用明显。研究区致密油有效储层可分为三类,其中Ⅰ类有效储层为本区的"甜点"区,是下一步优先勘探开发的重点区块,Ⅱ-Ⅲ类有效储层则是重要的挖潜区,通过工程技术攻关可切实实现柴西地区的增产扩能。  相似文献   

柴达木盆地东部上石炭统克鲁克组碎屑岩储层特征及控制因素     

祁柯宁  彭博  李宗星  刘成林  谢庆宾 《地质论评》2018,64(5):1263-1276

柴达木盆地上石炭统克鲁克组是该区重要的古生界勘探层位,组内发育多套良好的碎屑岩层。为探究其岩石物性特征及控制因素,本次以野外露头调查为基础,利用普通薄片、铸体薄片鉴定及扫描电镜等手段,结合物性测试和压汞资料,对克鲁克组碎屑岩纵向分布规律,储层岩性、物性、孔喉特征及孔隙类型进行分析。认为克鲁克地层中克2段发育的三角洲前缘亚相和克3段的具障壁海岸潮坪相的大套含砾粗砂岩、粗砂岩砂体原生、次生孔洞发育,孔喉大、分布集中、分选好,为有利的碎屑岩储层。早成岩期压实作用、重结晶及胶结作用对克鲁克组砂岩的原生孔隙破坏严重,晚成岩期储层改造形成的溶孔、裂缝—溶孔是油气成藏的主要储存空间。该研究为预测柴东石炭系克鲁克组油气有利区域提供依据,为今后该地区的油气勘探提供理论支撑。  相似文献   

Abiotic Methane Reservoirs in the Western Tianshan HP–UHP Metamorphic Belt,China          下载免费PDF全文

ZHANG Lijuan  ZHANG Lifei  LI Xiaowei  WANG Xiao 《《地质学报》英文版》2023,97(1):337-349

Natural gas, consisting primarily of methane(CH₄), has become a major source of clean energy in modern society in many parts of the globe. Recent experimental observations and discoveries of deep-sourced abiotic CH₄ in cold subduction zones indicate the important ability of cold subducted slabs to generate natural gas reservoirs. However, most CH₄ flux and reservoirs remain unknown and their potential is overlooked in global carbon flux estimations. Massive abiot...  相似文献   

Petroleum in the Jurassic Reservoirs within the Eastern Fukang Sub-depression, Junggar Basin, NW China: Correlation and Source Rock     

CHENG Bin  LIU Hu  ZHANG Kuihu  REN Xincheng  MENG Xiangyu  LIU Dezhi 《《地质学报》英文版》2023,97(3):777-795

The origin and source of the petroleum in the Jurassic reservoirs within the eastern Fukang sub-depression were geochemically investigated. They show thermal maturities matching the peak generation stage, while the condensates are at the early stage of intense cracking. Oils and condensates may have experienced mild evaporative fractionation, while mixing of severely biodegraded with non-biodegraded oils has occurred. Using biomarkers and isotopes, petroleums were classified into Group I, II and III genetic groups, with Group III further divided into IIIa and IIIb subgroups. Group I petroleum displays heavy carbon isotopes, a strong predominance of pristine over phytane, high C19 and C20 tricyclic and C24 tetracyclic terpanes, low gammacerane, and dominant C29 steranes, while Group II shows light carbon isotopes, a predominance of phytane over pristine, high C21 and C23 tricyclic with low C24 tetracyclic terpanes, high gammacerane and dominant C27 steranes. Group IIIa petroleum shows mixing compositions of Group I and II, while Group IIIb displays similar compositions to Group I, but with significantly higher Ts, C29Ts and C30 diahopane proportions. Oil-source rock correlation suggests Group I and II petroleums originate from Jurassic and Permian source rocks, respectively, while Group IIIa are mixtures sourced from these rocks and IIIb are mixtures from Jurassic and Triassic source rocks.  相似文献