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地层埋藏史研究是分析地热史、生烃史、排烃史和油气运聚史的基础,是盆地构造分析的有效方法。通过对四川复合型前陆盆地地层接触关系、构造运动期次、钻井取得的地层厚度和岩性资料的分析,利用地层分段回剥技术,编制了33口探井单井埋藏史图件。研究结果表明:①埋藏史曲线可划分出5种沉降类型,不同类型沉降曲线代表了不同的地质意义;②前陆盆地靠造山带一侧的沉降较靠稳定陆块一侧的沉降大,但也有例外;③从沉降量来看,自晚三叠世以来,川西中部都江堰附近的沉降量达9 500m,川北通江附近则为7 200m,分析认为这是造山带载荷与沉积载荷不同所致;④四川复合型前陆盆地的沉降机制应是挠曲负载。
The burial history of stratigraphy is the basis for the analysis of geothermal history, hydrocarbon generation history, hydrocarbon expulsion history and hydrocarbon migration and accumulation history, and is an effective method for tectonic analysis of the basin. Based on the analysis of stratigraphic contact, tectonic movement, thickness of strata and lithology data obtained from drilling in the complex foreland basin of Sichuan Province, 33 maps of single-well burial history of exploration wells were prepared by using the stratum back-stripping technique. The results show that: ① Buried history curve can be divided into five types of subsidence, different types of subsidence curves represent different geological significance; ② foreland basin on one side of the subsidence by the stability of land mass more than the settlement side, There are also some exceptions; ③ From the perspective of subsidence, since the Late Triassic, the settlement near the central western Sichuan Dujiangyan reaches 9 500 m and the area near the Tongjiang River in North Sichuan reaches 7 200 m. It is considered that this is due to the difference between the orogenic load and sediment load ; ④ The settlement mechanism of the Sichuan composite foreland basin should be a flexural load.