In order to remedy the defect that the classic 555 circuit are sometimes out of control,the bottom control time base circuit is designed.Design scheme:put the upper limit,lower limit and minimum potential comparison circuit of signal input in parallel,with three output isolated by two resistors.Then a series connection of the two resistors is connected with the input of trigger.Therefore,the bottom control time base circuit not only has a limit control function but also a bottom control function,which can prevent the load out of control.It can improve the safety performance and reduce the risk of fire or overpressure explosion under the circumstance of controlling temperature,pressure,and timing circuit,etc.In conclusion,the bottom control time base circuit has important practical value and social benefits.

In order to clear the cause of sand body of the lower Cretaceous in up-salt Kenjiyake oilfield , the oil and gas fields ’ development were guided .Therefore , under the condition of dense well pattern , the comprehensive data of core, rock slices, analysis and laboratory, ancient biology, well logging and so on to study the granularity , structure , composition of the sand body ’ s reservoir and the distribution law of sand body was used .Then the results show that:the reservoirs in Baliemu formation of the middle Cretaceous are mainly fine sandstone and siltstone ;Sandstone has some small cross bedding and horizontal bedding ;the compositional maturity of sandstone is medium while the texture maturity of sandstone is high .Delta plain that is in the northwest has the Dual Structure .Vertical-ly,the upper the sequence , the finer the grain size ; The sand body in the study area is distributed in a single shape , this form has the typical sedimentary characteristics of the meandering river delta;In this areas have been identified delta front , delta plain , frontal delta , shallow lake , including 10 kinds of microfacies:distributary chan-nel, subaqueous distributary channel , shallow lake sand bars , ect.At the same time the distribution patterns of sand bodies and the sedimentary characteristics have been analyzed;During the second member of Baliemu forma-tion period delta front subfacies main distribute in the west of the study area , while in the first member of Baliemu formation period the whole area evolves the former delta-shallow lake subfacies which is the typical retrogradational delta;This study provides important geological basis for the development of Kenjiyake oilfield .

哈萨克斯坦肯基亚克盐上油田侏罗系为一套陆源碎屑沉积，目前该区沉积相类型存在争议、砂体特征不清楚，生产矛盾突出。因此，在高密度井网条件下（50￣100 m井距)，通过岩心观察、粒度分析、测井解释，从大地构造、古气候、湖泊类型等方面，对肯基亚克盐上油田侏罗系中统沉积特征进行研究。研究表明：侏罗系中统沉积时期为地势平坦、温暖潮湿的浅水潟湖环境；其发育粒度细、分选磨圆好、泥岩呈暗色并含有生物碎片层的浅水三角洲相和澙湖相沉积，其砂体呈现出“星状”、“树枝状”、“网-带状”等特征；星状砂体主要为湖平面上升时期，波浪作用的结果；树枝状砂体主要为河控砂体；网-带状砂体主要为河流和湖浪共同作用的结果。该区共识别出三角洲平原、三角洲前缘、前三角洲、浅湖4个亚相以及水上分支河道、河漫、水下分支河道等10个微相；分析了各微相和砂体的平面展布特征及其影响因素，这为开发、注水、气驱、聚驱方式的优化提供了地质依据。