准噶尔盆地盆1井西凹陷东斜坡前哨2井在侏罗系三工河组获高产工业气流,开辟了斜坡区三工河组天然气勘探高效领域.为进一步明确该区三工河组油气藏主控因素和油气富集规律,深化三工河组油气勘探,在已钻探井基础上,综合应用岩心、实验分析和地震等资料,对三工河组油气藏类型、成藏特征和控制因素进行研究.结果表明:东斜坡侏罗系三工河组油气主要来源于盆1井西凹陷二叠系下乌尔禾组烃源岩;该区发育深、中、浅3期断裂,垂向上呈"Y"字型组合,配置关系良好,为油气从深层向浅层侏罗系运移提供了良好的输导条件,海西期大型断裂带控制了侏罗系油气的平面分布;三工河组油气藏类型为构造岩性和岩性型油气藏,受古地貌、沉积相带和断裂等因素共同控制,具有"烃源岩供烃、多期断裂接力输导、古地貌控带、凹槽控砂、断裂—砂体控藏"的成藏特征.

为了解决准噶尔盆地南缘地区低阻油气藏饱和度计算数值不准问题,以玛河气田古近系紫泥泉子组低阻砂岩气藏为例.通过孔渗、岩电、铸体薄片、阳离子交换容量等实验数据,研究分析阳离子交换量、阳离子当量电导、阳离子交换容量、胶结指数、饱和度指数等参数的变化规律,建立适用于低阻砂岩气层含水饱和度计算的变参数的Archie饱和度模型和Wax-man-Smits(W-S)饱和度模型,并进行实例井验证,获得良好效果.研究结果表明:在低阻砂岩气层中,常规的Archie模型适用于胶结指数、饱和度指数较小的纯产气或电阻率较低的水层,但在气水同层中解释效果较差;而通过变参数的Archie与W-S模型计算出的含水饱和度值均满足同一段储层下部含水饱和度大于储层上部的规律特征,其结果数据与岩心分析、气测试结果相吻合.两种饱和度计算新模型对低阻砂岩气藏储层饱和度的解释精度和流体识别的准确度提高方面具有重要指导意义.

新疆油田K21井三工河组于2013年获得油气勘探突破.但由于生产初期,射孔投产的两个小层在流体性质、物性方面的差异,产生了两小层是否属于同一个油藏、大规模改造后为何长期低产以及有无进一步增产的潜力等问题.通过对该井测试、试采资料的综合应用,在客观分析地层流体、压力系统、储层参数的基础上,较为完满地解决了上述问题.

By contrasting the lithology and content of clay mineral and analyzing reservoir core sensibility in KT-3 well area,Kelamay group reservoir under KT-3 well area is investigated which has stronger water sensitive characteristic.By integral researching and fracture project optimizing and during fracturing construction in the follow-up well in KT-3 well area,large-scale compound dehydrate crude oil fracturing is used to conquer many technical problem,such as stronger water sensitive、high stream resistance、low penetrability and low temperature and so on.In 2005,six times of compound dehydrate crude oil fracturing are applied which makes oil output of single well is more than 6 tons and change the cognition about low output and low income of Kelamay group reservoir.There is a big increase in the reservoir evaluation of K oilfield.

TH油田是以奥陶系碳酸盐岩储层为主力油层的特大型油田,储层以孔隙、溶洞和裂缝作为储集空间,具有双重或多重介质的特征.该碳酸盐岩油藏在钻井过程中,经常发生放空或漏失现象,大量非地层流体的侵入,造成了对储层的极大伤害.因而在TH油田,大多数的油井都需要经过酸化压裂改造储层后才能投产.由于储层埋藏深、酸压改造的液量大,所以采取快速高效的排液措施成为油田开发生产的关键技术.2003年,TH油田引进了制氮车,并配套采用了连续气举排液技术,有效地解决了返排酸液的难题,缩短了油井的评价周期.

由于油藏地质情况复杂,在钻井过程中,部分探井的含油气目标受到钻井液浸泡而发生垮塌,井径扩大,致使在固井时形成厚层水泥环而"屏蔽"油气层,给以后的油层改造等施工作业造成困难.2000年以来新疆油田成功引进了深穿透射孔技术,在准噶尔盆地地质条件相对复杂的莫索湾探区及卡因迪克探区应用,能穿透厚层水泥环,射开岩性致密、低渗透目的层段,在确定合理的酸液配方后,加以酸化改造,有效地解放了油气层,实现了油气勘探的巨大突破.

用不同的方法对彩016井和泉1井的气井无阻流量进行了计算,并对比了计算结果.分析认为,进行系统试井,并在其后紧接着测恢复压力的方法,所得到的资料和计算结果比较可靠.这种常规方法,尽管测试周期长、费用高,但获取的诸多参数却是其它方法无法比拟的.在勘探新区应坚持采用常规方法,只有在油气藏特性都十分明了的情况下,才可以采用其它方法(例如试井方程法等)进行试井.

By in fl uences of internal and external factors in the reservoir,different deviations of production and pressure data from stable well testing in gas well tend to res ulting in abnormal shape of productivity curve,which is difficult to get open-flow capacity.In some cases,retesting has to be needed.The major factors for them include reservoir pollution,variable skin factor,interlayer interference and sand face flux,etc.And different factors have different effects on well test data in feature and extent.For this reason,SWT2000,a well-testing software,is applied for analysis of the abnormal phenomenon in well test data, and suitable correction model is selected for effective elimination of the falsi fication phenomenon of the curves,followed by obtaining the productivity parame ters of the gas well.Practice shows that the reliable pro-ductivity parameter s can be obtained if we make correct adjustment of abnormal factors of well te st data,as well as selection of proper cor-rection model.