Efficient development of deep tight reservoirs in the southern margin of the Junggar Basin requires stimulation technology, and effective propped hydraulic fractures are the key to successful stimulation. To optimize the proppant selected for reservoir stimulation, the important parameters of proppant selection were determined through the proppant conductivity evaluation experimental study and field test, considering the influences of high temperature and high closure pressure. The results show that closure pressure, temperature, and sand concentration have a great influence on the conductivity of the proppant pack. The conductivity of the proppant pack decreases by about 10% at high temperatures, which is because the high temperature will rupture more proppant and thus reduce proppant pack permeability. In the long term, the Scenario B placement pattern can maintain high conductivity, and the long-term conductivity is increased by 6–26% compared with the Scenario C placement pattern. Furthermore, increasing the proppant placement concentration is conducive to the long-term conductivity of the fracture. During the operation of the test well, the treatment pressure was stable, and the fractures were effectively propped. No proppant flowing back occurred in the test production after the fracturing treatment, which achieved the purpose of the evaluation well, provided support for the large-scale development of subsequent development wells, and ensured orderly development.

为厘清玛131小井距立体开发平台的产能水平和生产动态特征,进行了生产特征、不稳定产量及产能预测,构建了动态分析及产能预测工作流程,确定了等效地层渗透率、有效裂缝半长等预测单井产能的关键参数.目标油藏原油易脱气,早期下入井下气嘴可有效减轻脱气现象;返排前期油嘴过大,会导致裂缝体积大幅减小,需要控压返排;基于递减曲线和解析模型的P50产能预测结果可以互为补充,提供更为准确合理的产能预测区间;百三段水平井的平均有效裂缝半长大于百二段一亚段,其井距存在优化的空间.

页岩油压裂水平井投产前普遍先闷井,为快速评价体积压裂效果,提出基于页岩油藏闷井压力数据的压后评估方法.通过闷井数值模拟,表征压裂水平井缝网改造区域的压力扩散与流体运移规律,并建立闭合后线性流计算模型和裂缝储集控制数学模型,形成反演裂缝参数与地层压力的计算方法.结果表明,压裂停泵后改造区域依次经历井筒末段裂缝控制、全井段裂缝控制以及储集层基质控制下的9个流动阶段,其压降导数在双对数坐标下为不同斜率的多个直线段;应用于吉木萨尔凹陷4口典型页岩油水平井,证明了闷井压力数据能用于裂缝参数和地层压力反演,也验证了提出方法的适用性,可供评价压裂作业效果和优化平台井距借鉴.

选取南缘高探1井井下油管和地面井口弯头处堵塞物,通过高温灼烧、X射线衍射法进行矿物成分分析、薄层色谱等进行有机物族组成测试,采用高温高压流动模拟装置研究无机物对沥青质析出的影响.结果表明:高探1井原油CⅡ值为4.15,原油不稳定;主要组成为无机物(质量分数分别为62.25％和17.95％)和有机物(质量分数分别为37.75％和82.05％),无机物主要来源于钻井液加重剂,有机物为沥青质;沥青质易吸附在无机颗粒表面,无机物会促进沥青质的析出和沉积.根据油井特性,提出间歇改变油嘴工作制度防治沥青质析出对策,现场采用正挤沥青分散剂对井筒堵塞物进行解堵作业,油压平均增幅为4～8 MPa,清管效果明显.

细分切割体积压裂技术已在玛湖11个致密砾岩油藏应用118井次,验证了工艺的针对性和可操作性,压裂工程参数指标不断取得突破,水平井生产效果显著提升,但合理压裂工程参数与最优生产效果间的匹配关系仍不确定.为了优选合理的工程技术参数范围以指导后续水平井压裂设计,也为了提高致密砾岩油藏开发综合效益,开展体积压裂技术适应性研究.通过数据统计和趋势预测等分析手段,将水平井压后产量、压力等生产数据与体积压裂方式、完井压裂工艺、裂缝参数、压裂规模、压裂材料选型等压裂工程参数相对应开展分析.研究表明,针对物性较差的常压油藏,合理的压裂裂缝间距为25～35m,合理改造规模为加砂强度1.2～1.5m3/m、砂液比(1∶17)～(1∶20);针对物性较好的异常高压油藏,合理的压裂裂缝间距为40m左右,合理改造规模为加砂强度1.0～ 1.2m3/m、砂液比(1∶15)～ (1∶17).同时证明,精准定点有控压裂可在同等条件下将改造效果提高20％以上;在油藏埋深小于3500m、闭合应力低于55MPa的区块,石英砂可有效替代陶粒,具备进一步扩大应用规模的条件.

为了揭示物质组分对火成岩风化壳储层发育程度的影响,在全岩分析基础上,以碱度为分类依据选取了32块不同碱度的新鲜火成岩样品,通过室内溶蚀实验模拟岩石在风化淋滤作用下的增孔特征,比较样品溶蚀前后的孔隙分布特征以及孔隙度、渗透率值大小,结合井下不同碱度天然溶蚀火成岩样品的储层特征,对不同碱度火成岩发育风化壳储层的差异性进行了对比和分析.溶蚀实验中化学成分上判别为过碱性的火成岩绝对增孔平均约5％以上,碱性岩绝对增孔约4.6％,而钙碱性火成岩绝对增孔只有2.1％,表明碱度特征是火成岩次生储集空间发育的重要控制因素.通过岩石主量元素与增孔值回归分析,明确K、Na、Ca、Mg等元素含量与火成岩溶蚀增孔能力具有较好的相关性.碱度较高的火成岩中因为含有相对较多的活性组分,在相似的酸介质环境下,其比钙碱性火成岩溶蚀增孔的能力更强.

对准噶尔盆地南缘古近系紫泥泉子组的沉积构造背景、沉积相标志进行分析,认为玛河气田紫泥泉子组为辫状河三角洲沉积,发育辫状河三角洲平原、三角洲前缘、前三角洲3种亚相及水下分流河道等8种微相,整体显示湖退—湖侵的沉积演化特征.对比沉积相与物性、产能特征后认为,最有利的沉积微相为水下分流河道.

准噶尔盆地阜东地区侏罗系头屯河组储层具有较低成分成熟度、低填隙物含量、成岩作用较弱和方解石普遍发育的特征；储集空间类型以剩余原生粒间孔为主，主要为中孔、低渗型储层，局部发育中孔、中渗型储层，储层控制因素主要为沉积相带，其次为后期成岩作用和埋藏深度。以核磁测井解释的孔隙度、渗透率为关键参数，结合岩矿特征、物性、成岩相、沉积相以及产能性质，将区内砂岩储层划分为4类，最优质储层（Ⅰ类储层）在局部地区发育，大部分地区主要以较优质储层（Ⅱ、Ⅲ类储层）为主。

The reservoir characteristics including lithology,lithofacies,pore type of the Carboniferous volcanic rocks in the 6th,the 7th and the 9th areas of Karamay oil field are analyzed based upon core observation,thin section identification,scanning electron microscope analysis and well logging interpretation.The reservoir pore space types,relationship between the reservoir spaces and flowing passageway and main parameters affecting the reservoir quality are also studied.The results indicate that the major rocks are lava which includes basalt and andesite,pyroclastics and pyroclastic sedimentary which includes volcanic breccia,tuff and sedimentary tuff.Three types of reservoir spaces including vesicles,pores and fractures can be classified based on the pore structures,and the primary and secondary pores can be identified based upon origin.The major controlling parameters for reservoir quality are petrology,lithofacies and tectonic action as well as weathering and leaching processes.

The Baikouquan formation (T1b) of Triassic in Wuerhe oilfield can be divided into one long-stage semi-cycle (LSC), three mid-stage cycles (MSC) and seven short-stage cycles (SSC) which are in correspondence with the sandbody development period, that is, each period sandbody developed in each SSC correspondingly. The cycle evolvement is characterized by asymmetry-cycle, symmetry-cycle and asymmetry-cycle from bottom to top. The first asymmetry-cycle is resulted from that the sediments of previous stratum descending stage were washed down by post fluvial channels, followed by shaping scour surfaces; the last one is due to the increasing accommodations allowing descending cycles to be under-compensation sediments. The major reservoir units, MSC1 and middle-bottom part of MSC2, are located in eary-middle period of LSC and composed of retrograding-upgrading SSC sediments with overlapped sand-gravel lithologies in middle-fan sub-facies of alluvial fan. The quality and productivity of MSC1 reservoirs are obviously better than those of MSC2 reservoirs.

The west slope in Mobei-Mosuowan swell in Junggar basin lies chronically in the target area of oil-gas migration. From the north to the south of this slope, Mobei field, Mosuowan field and Moxizhuang oil field have been found. It is one of the oil-enriched structural belts in the hinterland part of Junggar basin, in which the reservoirs are all distributed along the swell side with arcuate and beaded configuration and controlled by faults, structures and deposition. However, these reservoirs with complex distribution are still of particularity and regularity. This paper analyzes and summarizes the regularity of hydrocarbon accumulation in this area for further exploration here in the future.