论文部分内容阅读
通过反转构造地震反射特征、分布特征及形成机理研究,分析了珠江口盆地珠Ⅲ坳陷反转构造形成期次,划分了该区反转构造样式,研究了反转构造对油气成藏条件的影响。研究认为该区发育古近纪末期断陷反转和新近纪晚期拗陷反转2期反转构造幕,早期反转构造发生在古近纪,是在断陷期—断拗转换期之上的叠加构造,晚期反转构造发生在新近纪,是盆地坳陷期之上的叠加构造。依据反转构造与先存断裂和构造的关系,珠Ⅲ坳陷反转构造样式可划分为断层限制型和褶皱挠曲型2个大类,细分为5类断层限制型和3类褶皱挠曲型反转构造样式。反转构造可以形成良好的油气聚集圈闭条件,但早期反转会使烃源岩埋藏变浅,难以达到生烃门限而导致生烃能力很小,晚期反转构造油气成藏条件良好,特别是坳陷西部较大反转构造是有利勘探区带。
Based on the research on seismic reflection characteristics, distribution characteristics and formation mechanism of inverted tectonics, the reverse formation structure of the Zhu Ⅲ Depression in the Pearl River Mouth Basin was analyzed and the reversal tectonic styles of the area were analyzed. Impact. The study suggests that the area developed the reverse faulting reversal in the late Paleogene and the inverted inversion tectonic curtain in the late Neogene depression. The early reversal structure occurred in the Paleogene, which was above the transitional period from fault depression to fault depression Late inversion structure occurred in the Neogene, which is a superimposed structure over the depression in the basin. Based on the relationship between inversion structure and preexisting faults and tectonics, the inverted structural styles of the Zhu Ⅲ Depression can be divided into two major categories: fault-limited type and fold-flexural type, which are subdivided into five types of fault-limited type and three types of fold- Curved reverse structural style. Inverted structure can form favorable trapping conditions for oil and gas accumulation. However, the early reversal will make the source rock burial shallow, it is difficult to reach the hydrocarbon generation threshold, resulting in a very low hydrocarbon generation potential. Late inversion structural oil and gas accumulation conditions are good, The larger inversion structure in the western part of the depression is a favorable exploration zone.