The Kiloton Class Jiaojia Gold Deposit in Eastern Shandong Province and Its Genesis

The recent deep prospecting results in the Jiaojia area of Eastern Shandong Province indicate that the Jiaojia ore field composed of several individual gold deposits as previously suggested is actually an ultra-large gold deposit.This deposit covers an area of ～40 km2,and shows a structural control by the Jiaojia fault and its secondary faults.Gold orebodies generally occur along the same mineralization-alteration belt,and the main orebodies intersect with each other or exhibit a parallel or overlapping distribution.This deposit＇s reserves are estimated to be 1,200t of gold,being the first gold deposit of more than 1000t gold reserves in China.The No.Ⅰ-1 orebody in the Shaling-deep Sizhuang ore blocks holds gold reserves greater than 350 t,or 29 percent of the total reserves,followed by the No.Ⅰ orebody in Matang-Jiaojia ore blocks with exceeding 150t gold reserves.This deposit mainly occurs in the footwall of the Jiaojia fault,and presents zoned patterns in mineralization,alteration and structures.The strongly mineralized zones agree with strongly altered and tectonically fractured zones.These orebodies display strataform-like,veinlike or lenticular shapes,and generally show characteristics of pinching out and reappearing,branching and converging,expanding and shrinking.The orebodies commonly occur along positions where the fault strike changes and in gentle locations with dips changing from steep to gentle.The main orebodies are parallel to the main plane of the orecontrolling fault,and tend to be gentle from the surface to the deep.The orebodies mainly plunge to the southwest,with plunge angle of 45°-606° Orebodies near the main plane of the ore-controlling fault have more gold resource than those away from main fault zone.The slant depth of orebodies is generally larger than the length along its strike direction; orebodies become thick and gold grades become low from the shallow area to the deep area.Ore-forming fluids are H2O-CO2-NaCl±CH4 type with medium-temperature and moderate to low salinity.Sulfur isotopic values （δ34SCDT） for gold ores range between 11.08‰ and 12.58‰,indicating mixed sulfur sources; hydrogen isotopic values （δDVSMOW） range from-83.68‰ to-116.95‰ and oxygen isotopic values （δ18OV-SMOW） range between 12.04‰ and 16.28‰.The hydrogen and oxygen isotopes suggest that ore-forming fluids originated from primary magma,and mixing with a large amount of atmospheric water during the late stage.The Eastern Shandong Province gold deposits are associated with magmatic activities which have mantle crust-mixed source,and also share some similarities with orgenic and epithermal hydrothermal golddeposits.Because Eastern Shandong Province gold deposits with unique metailogenic features and formation setting which are different from other gold deposit types in the world,we call it the Jiaojiatype gold deposits.The kiloton class Jiaojia gold deposit is related to fluid activities,extension and detachment resulted from thermal upweiling of magmas.The strong magmatic activities in the middle to late stage of early Cretaceous in Eastern Shandong Province lead to active fluids,and provided abundant ore-forming materials for gold depsoits.Moreover,many extensional structures resulting from crustal extension provided favourable space for orebody positioning.

Research on adaptive anti-rollover control of kiloton bridge transporting and laying vehicles

The SPMT construction method is a new rapid construction technology of large urban overpass with unblocked traffic,and unstability of SPMT construction method equipment cannot be accurately described due to the concrete beam size,irregular shape and complex transport conditions,which is called kiloton bridge transporting and laying vehicle.The anti-rollover performance of SPMT suspension system is studied,and vehicle side slip angle and load transfer rate(LTR) are regarded as the evaluation indexes.An active suspension adaptive anti-rollover control model of SPMT,in which roll stability affected by the structural parameters and control parameters,is built based on fuzzy PID,and the effectiveness of the control method is verified through real vehicle test.

盐下高压特低渗透油田钻完井关键技术

肯基亚克盐下油藏是埋藏在3000 m厚的盐丘下的地质条件复杂、低孔特低渗、异常高压碳酸盐岩油藏。开发初期曾遇到的问题是地层结构复杂、巨厚的盐丘难以钻进、射孔完井产量低,钻井成本高,不具备经济开采的价值。在认真研究油藏地质特征、地层压力和工艺要求的基础上,通过简化井身结构,筛选适合于盐丘地层的钻井液体系,尝试裸眼完井方法等手段,有效地把直井的钻井周期从原来的500 d左右缩短到180 d左右,单井初始产量从原来的30多吨提高到平均200 t以上,多口井初始产量达到500 m3/d以上,有一口井初始日产量千吨以上。盐下钻井周期缩短和单井产量提高的因素很多,但是井身结构简化、突破巨厚盐丘的钻井技术和裸眼完井方法是其中最关键的技术。

塔里木盆地超深层千吨井油气地质与高效区分布规律

断控缝洞型碳酸盐岩油气资源潜力巨大,但其控储控藏控富机理十分复杂,超深领域勘探开发难度更大、成本更高,培育高产井、高效井是推动超深领域资源优势转化为效益优势的重要途径。基于地球物理、油气地质、油层物理、地球化学等多学科动静态结合研究,阐明了多源流体、多期溶蚀、叠加复合的断控岩溶缝洞体形成机理与走滑断裂、不整合面为输导格架的多期成藏机理,构建了塔里木盆地富满油田超深断控缝洞型碳酸盐岩油气成藏地质模型,揭示了以Ⅰ级断裂破碎带为主线、大型缝洞体为主体、正地貌为背景的高效井分布规律;同时,创新形成了定断裂带、定富集段、定目标井、定井型与选位置、选靶点、选靶层、选靶向的“四定+四选”井位部署配套技术。据此部署的具有“主干断裂+正地貌+长串珠”特征的一批井点均获高产或成为千吨井,大幅提高了单井产量与最终可采储量(EUR),指导了勘探开发领域向纵深挺进,发现落实富满油田10×10^(8)t油气储量并建成300×10^(4)t级大油气田。