论文部分内容阅读
笔架盆地位于南海北部大陆边缘南部,是一个新生代沉积盆地。盆地发育了A,B,C三套地震层序;盆地内地质构造复杂,断裂发育,平面上断裂展布方向主要有NE向、近EW向和NW向三组,断裂可分为正断层及平移断层,以正断层为主。笔架盆地新生代发育经历了断陷、坳陷和区域沉降三个发育阶段。受神狐运动的影响,古新世—早渐新世为盆地形成时期-断陷阶段,由于受NW-SE地壳应力向拉张作用,产生了一系列NE向或NEE向断裂和彼此相间的地堑和半地堑,形成了笔架盆地的雏形。盆地内部充填了大量河湖相沉积。晚渐新世-中中新世为盆地发展期-坳陷阶段,受南海中央海盆扩张的影响,南海北部普遍下沉,盆地沉积类型也随之发生变化,陆相逐步过渡到海陆过渡相和海相。晚中新世-全新世为盆地成熟期-区域沉降阶段,盆地以稳定的半深海-深海相沉积为主。古近系以断陷陆相河湖相、三角洲相沉积为特征,分布范围较广,最大沉积厚度超过1700 m,具有一定的生烃能力;盆地储盖条件良好,油气运移条件良好;笔架盆地具备一定的油气潜力。
Beacon basin is located in the southern margin of the southern South China Sea is a Cenozoic sedimentary basin. There are three sets of seismic sequences of A, B and C in the basin. The geological structure of the basin is complex and the faults are developed. There are mainly three directions of NE, near EW and NW directions in the plane. The faults can be divided into normal faults and Translating the fault to the normal fault. The Cenozoic development of the Beacon Basin experienced three developmental stages of depression, depression and regional subsidence. Affected by the Shenhu movement, the Paleocene-Oligocene is the basin-forming-faulting phase. Due to the NW-SE crustal stress stretching, a series of NE-trending or NEE-trending faults and their interphasic Grabens and half-graben, forming the prototype of pen holder basin. Basin filled with a large number of rivers and lakes deposition. Late Oligocene -Mid-Neo-Neo-Miocene is basin-development-depression stage. Due to the expansion of the central South China Sea basin, the northern South China Sea generally subsided, and the sedimentary types of the basin also changed. The continental facies gradually transitioned to the transitional phase of land and sea Sea phase. Late Miocene - Holocene basin maturity - regional subsidence stage, the basin to stable semi-deep-sea sediments. The Paleogene is characterized by continental facies and lacustrine facies and delta facies sedimentary deposits, with a wide distribution and a maximum sedimentary thickness of more than 1700 m, which has certain hydrocarbon generating ability. The basin has good reservoir conditions and favorable hydrocarbon migration conditions. Certain hydrocarbon potential.