汤原断陷汤4井评价与油气成藏分析  

Evaluation of Well Tang4 and Analysis on Oil and Gas Accumulation in Tangyuan Fault Depression

作　　者：张继伟[1] Zhang Jiwei(Exploration and Development Research Institute of Daqing Oilfield Co., Ltd., Daqing Heilongjiang 163712)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《中外能源》2019年第5期26-32,共7页Sino-Global Energy

基　　金：中国石油天然气股份有限公司"十三五"重大科技专项"大庆油气持续有效发展关键技术研究与应用"(编号:2017ZX03001-002)资助

摘　　要：2018年初完钻的汤4井为汤原断陷首口工业油流井,其单井石油地质条件评价表明:烃源岩为Ⅱ2型、中等丰度,其中达连河组处于低成熟阶段,新安村+乌云组达到成熟;储层物性整体较好,其中达连河组储层物性好于新安村+乌云组储层;达连河组一段盖层条件差,宝泉岭组一段区域性盖层条件好。汤4井天然气为生物气和热催化阶段的原油伴生气混合,达连河组原油为汤4井和汤1井区新安村+乌云组地层生烃贡献。该区经历两期成藏,生油门限为现今的2200m。由影响成藏过程的源岩、超压及断盖条件分析入手,分析两期成藏关键时期的油气运聚过程,提出"近凹斜坡带源岩-断盖双控"成藏模式,最终对汤1井、汤参2井、汤3井三口邻井未成油藏原因进行分析。汤4井的成功经验和三口探井失利的教训可有效指导未来部署工作,有望实现汤原断陷更大规模场面的油气突破。Well Tang4 drilled in early 2018 is the first industrial oil well in Tangyuan Fault Depression.The evaluation of its petroleum geological conditions shows that the source rocks are type Ⅱ2 with medium abundance,among them the Dalianhe Formation is at low mature stage and the Xin ′ancun+Wuyun Formation is at mature stage.The physical properties of the reservoirs are generally good that in Dalianhe Formation are bet-ter than in Xin′ ancun +Wuyun Formation.Caprock condition in Member 1 of Dalianhe Formation is poor and regional caprock condition in Member 1 of Baoquanling Formation is good.Natural gas in Well Tang4 is a mixture of biogas and associated gas of crude oil at the thermal catalytic stage,and the crude oil in the Dalianhe Formation contributes to oil and gas generation in Xin ′ancun+Wuyun Formation in Well Tang4 and Well Tang1.Two stages of oil and gas accumulation experienced in this region,and the oil generation threshold is 2200 m at present.Based on the analysis of source rock,overpressure,fault and caprock conditions that influence the accumulation process,the oil and gas migration and accumulation process in the key period of two-stage accumulation was analyzed.Accumulation model of "source-fault-caprock controlling in the near-concave slope zone" was proposed.Finally,the reasons for accumulation failure in Well Tang1,Tangcan2 and Tang3 were analyzed.The successful experiences of Well Tang4 and the failure of three exploration wells can effectively guide exploration in the future,and the oil and gas breakthrough in Tangyuan Fault Depression on a larger scale is hopefully achieved.

关 键 词：汤 4 井 石油地质条件评价 油气来源 成藏期次 成藏过程 主控因素 

分 类 号：P618.13[天文地球—矿床学]