松辽盆地南部油气勘探新领域、新类型及资源潜力

New fields,new types and resource potentials of oil-gas exploration in southern Songliao Basin

松辽盆地南部在经历油气普查阶段、构造与岩性油气藏勘探开发阶段后,现已全面进入非常规油气的勘探开发阶段。在进一步挖掘现有油气资源开发潜力的同时,寻找新领域、新类型的油气资源成为支撑油田公司长远发展的关键。综合优选了扶杨油层致密油藏、长岭页岩油、基岩气藏、煤层气藏和裂缝型油藏5个已获得勘探开发突破或具有勘探开发潜力的新领域,对其典型地质特征及资源潜力展开分析,明确了下一步的攻关方向。5种油气资源均具有较大的勘探开发潜力,但研究程度、实践阶段和攻关方向各有不同。扶杨油层致密油的资源量为10×10^(8)t,2014年以来累计探明储量为1.28×10^(8)t,部分区带已经实现效益开发,处于拓展勘探开发阶段,是近期重点攻关的领域;优选让字井、新北—庙西、余字井、孤店、大情字井5个致密油"甜点区",持续推进一体化增储建产。长岭页岩油"甜点"的资源量为16.8×10^(8)t,目前已获得工业突破,处于先导试验攻关阶段;优选余字井、塔虎城2个"甜点区",青山口组Q1—Q3层和Q9层上、下2套"甜点层段",重点加快配套技术攻关,尽快实现商业突破。其余3种类型的油气资源均处于探索阶段,需要加强勘探理论认知,推进其资源潜力评价,优选有利区带,进一步揭示其勘探开发前景。

After experiencing hydrocarbon survey,tectonic and lithological reservoir exploration and development,the southern Songliao Basin has entered the stage of unconventional hydrocarbon exploration and development.Besides further exploring the development potential of available oil-gas resources,to seek the new fields and new types of oil-gas resources has become crucial for supporting the long-term growth of oilfield companies.By comprehensively evaluation,this study selects five new fields with breakthroughs or potentials in exploration and development,including the tight oil of Fuyang reservoir,shale oil of Changling sag,basement gas reservoir,coalbed methane reservoir,and fractured oil reservoir.Their typical geological characteristics and resource potentials are analyzed,and the next breakthrough direction is pointed out.These five types of oil-gas resources have substantial exploration and development potential,and there are differences in the levels of geological study,practice stages,and breakthrough directions.The resources of tight oil in Fuyang reservoir amount to 10×10^(8)t,with the cumulative proven reserves of 1.28×10^(8)t since 2014,and some plays have achieved cost-effective development and are in the stage of expanding exploration and development,which are the key research field.Moreover,the study selects five sweet spots in tight oil reservoirs,including Rangzijing,Xinbei-Miaoxi,Yuzijing,Gudian,and Daqingzijing,aiming to continuously promote the integrated strategy of increasing reserves and production.The resources of shale oil sweet spots in Changling sag amount to 16.8×10^(8)t,achieving industrial breakthroughs and currently in the breakthrough stage of pilot test.This study mainly focuses on two sweet spots,i.e.,Yuzijing and Tahucheng,and two sets of sweet spot intervals,i.e.,the upper interval(Q1-Q3 layers)and the lower interval(Q9 layer)of Qingshankou Formation,and accelerating the technological breakthrough in supporting techniques,so as to achieve commercial breakthroughs as soon as possible.The other three types of oil-gas resources are all in the exploration stage,for which it is necessary to strengthen the understanding of exploration theory,promote the evaluation of resource potential,optimize favorable plays,and further reveal the exploration and development prospects.