准噶尔盆地南缘小渠子地区勘探目标选择  

Exploration Target Selection in Xiaoquzi Region,Southern Margin of Junggar Basin

作　　者：彭天令[1] 张化龙[1] 夏雨[1] 郭忠[1] 姜元刚[1] 

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆乌鲁木齐830013

出　　处：《西南石油大学学报（自然科学版）》2014年第4期79-85,共7页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：针对小渠子地区构造形态落实不清楚的问题,在以往构造认识的基础上,充分利用地震、钻井、地面地质等资料,重新解释该区地震剖面。研究认为,西马庄背斜不存在,是妖魔山背斜向西南倾伏的鼻状构造;北小渠子背斜圈闭面积和闭合度明显增加,是有利勘探目标。综合分析该区烃源条件、构造演化、油气热演化、储盖组合及保存条件,认为构造成因是控制油气藏的关键因素。燕山期,南部掀斜作用使小渠子南部的二叠系、三叠系、侏罗系拗陷转变为隆起区,乌鲁木齐向斜中的相当一部分油气持续向南运移,其中的一部分通过断裂运移至南小渠子背斜带,是该区至今末获得较大突破的重要原因。南小渠子背斜具有形成早、发育时间长、圈闭面积大、闭合度高、储层物性较好的优越性,二叠系红雁池组、芦草沟组自生自储组合是下一步的勘探目标。北小渠子背斜具有良好的生、储、盖组合,虽然上仓房沟群、小泉沟群储层物性条件差,对成藏不利,但下仓房沟群中下部及以下地层未钻揭,其储层条件及成藏条件是下步研究目标。Aimed at the fuzzy problems of the structural configuration of the Xiaoquzi region clear, and based on the previous understanding of the structure, we reexplain the seismic section in this region by making use of some geological data, such as earthquake, well drilling, ground and so on. The study shows that the anticline in the Xima village does not exist, and it is a nose structure with the anticline of the Demon Mountain pitching to the southwest. The new structural map shows that there are obvious rise in the area of trap and closure of the anticline in the north of the Xiaoquzi region, which is a favorable exploration target. A comprehensive analysis of the source condition, tectonic evolution, the evolution of the oil, gas and heat evolution, facies reservoir-capping assemblage and preservation condition, reveals that tectonic genesis is the key factor controlling the oil-gas reservoir. In Yanshanian, due to the tilt of the south area, the depressions in the Permain, Triassic and Jurassic systems turned into uplifts, which made part of the oil and gas in the syncline of Urumqi move to south area, and part of oil and gas migrate to the anticlinal zone in the south of the Xiaoquzi through fault. That is the important reason why there is no breakthrough in the Xiaoquzi region. The anticline of the south Xiaoquzi region was formed early, and has developed for a very long time. There is a big area of trap with high closure and good reservoir property. The anticline of the north Xiaoquzi region is a good assemblage of production, reserve and coverage, especially with the rise of the area of trap and closure; although the upper Cangfanggou group and the little spring group have bad conditions for reserve and reservoir forming, the middle and lower part of the lower Cangfanggou group and the stratum below are not drilled, so the reservoir conditions and reservoir forming conditions are our further study target.

关 键 词：准噶尔盆地 构造 背斜 成藏 勘探目标 

分 类 号：TE132[石油与天然气工程—油气勘探]