川西南部盐井沟构造断层封堵性
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摘要
四川盆地西南部盐井沟构造须家河组经历多轮油气勘探仍无太大突破,该区构造形态和规模受断层控制,断层既可以为油气运移提供通道,也可以阻挡油气散失,断层封堵性对研究该区圈闭有效性、保存条件及油气运聚等具有重要意义。为研究该区断层封堵性,以对构造起主要控制作用的Y1、Y3号两条断层为研究对象,分析了断层发育特征、断层活动期次、断层侧向封堵性、断层垂向封堵性等,研究结果表明:①Y1号断层纵横向封堵性较好;②Y3号断层两侧砂岩对接较多,侧向封堵性较差,不利于该断层下盘油气聚集和保存。结论认为,该区保存条件较好的是盐井沟构造主体及Y1号断层下盘,可作为下一步油气勘探的目标,该认识与J1、J2井地层水资料分析结果一致。
No great breakthrough is realized in the Xujiahe Formation in Yanjinggou structure of southwestern Sichuan Basin, even through the exploration in this area has been carried out many rounds. The structural feature and scale in this area is controlled by faults. Faults can act as the hydrocarbon migration pathways and can prevent hydrocarbon dissipation, so their sealing property is of great significance for the trap validity, storage conditions and hydrocarbon migration and accumulation in this area. In this paper,Y1 and Y3 fault which play the controlling effect on the structure were taken as the research objects to study the sealing property of the faults in this area from the aspects of development characteristics, active stages, lateral sealing property and vertical sealing property. And the following research results were obtained. First, Y1 fault is better in vertical and lateral sealing properties. Second, the sandstones on both sides of Y3 fault contacts better, so its lateral sealing property is poor, which is not favorable for the hydrocarbon accumulation and preservation at its lower block. In conclusion, the well preserved zones in this area are the main part of Yanjinggou structure and the lower block of Y1 fault, and they can be taken as the exploration targets in the following step. This cognition is accordant with the analysis results on the formation water of Well J1 and J2.
No great breakthrough is realized in the Xujiahe Formation in Yanjinggou structure of southwestern Sichuan Basin, even through the exploration in this area has been carried out many rounds. The structural feature and scale in this area is controlled by faults. Faults can act as the hydrocarbon migration pathways and can prevent hydrocarbon dissipation, so their sealing property is of great significance for the trap validity, storage conditions and hydrocarbon migration and accumulation in this area. In this paper,Y1 and Y3 fault which play the controlling effect on the structure were taken as the research objects to study the sealing property of the faults in this area from the aspects of development characteristics, active stages, lateral sealing property and vertical sealing property. And the following research results were obtained. First, Y1 fault is better in vertical and lateral sealing properties. Second, the sandstones on both sides of Y3 fault contacts better, so its lateral sealing property is poor, which is not favorable for the hydrocarbon accumulation and preservation at its lower block. In conclusion, the well preserved zones in this area are the main part of Yanjinggou structure and the lower block of Y1 fault, and they can be taken as the exploration targets in the following step. This cognition is accordant with the analysis results on the formation water of Well J1 and J2.
引文
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[13]胡绪龙,李瑾,张敏,等.地层水化学特征参数判断气藏保存条件——以呼图壁、霍尔果斯油气田为例[J].天然气勘探与开发,2008,31(4):23-26.
[2]曾琪,马华灵,刘柏,等.苏码头构造须二段储层物性下限研究[J].天然气技术与经济,2016,10(6):6-8.
[3]杜民,刘金萍.北黄海盆地东部坳陷X构造A断块断层封堵性分析[J].地质学刊,2016,40(2):309-313.
[4]匡建超,曾剑毅,储昭奎,等.川西龙门山前缘主要断层封堵性评价[J].天然气工业,2008,28(11):42-45.
[5]王来斌,徐怀民.断层封闭性的研究进展[J].新疆石油学院学报,2003,15(1):11-15.
[6]尹春蕾.西湖凹陷Z构造断层封堵性研究[J].海洋石油,2016,36(1):12-16.
[7]侯读杰,朱俊章,唐友军,等.应用地球化学方法研究断层的渗漏性[J].石油与天然气地质,2004,25(5):565-569.
[8]梁波,王威,郝景宇.马路背地区主要“通天”断层垂向封闭性评价[J].天然气勘探与开发,2015,38(4):9-13.
[9]赵昕,郝曙嫣,戴为民,等.现河庄构造地层水变化与油气聚集的关系[J].天然气与石油,2012,30(3):53-56.
[10]徐振平,梅廉夫.川东北地区不同构造带地层水化学特征与油气保存的关系[J].海相油气地质,2006,11(4):29-33.
[11]贾倩,赵彦超,方度,等.伊通盆地岔路河断陷地层水化学特征与油气保存关系[J].地质科技情报,2008,27(2):63-67.
[12]任国选,侯读杰,史玉玲,等.准噶尔盆地西北缘红山嘴油田地层水特征与油气藏聚集关系[J].石油与天然气地质,2013,34(2):179-184.
[13]胡绪龙,李瑾,张敏,等.地层水化学特征参数判断气藏保存条件——以呼图壁、霍尔果斯油气田为例[J].天然气勘探与开发,2008,31(4):23-26.