西湖凹陷南段新生代岩浆岩时空分布特征及对成藏的影响.

The Cenozoic era in the southwest of Xihu Depression has undergone great changes in tectonic environment such as fault- depression-reversal, and magmatic activity has become frequent, which is of great significance for understanding the relationship between magmatic activity and hydrocarbon accumulation in this area. In this paper, the formation time and spatial distribution location of magma rock mass in this area are depicted by various geophysical means such as edge detection, amplitude attribute filtering, multi-Z value interpretation, and automatic tracking, and the distribution rules and controlling factors of magma rock mass are analyzed. Combined with the evolution of magmatic activity, the influence of magma activity on hydrocarbon accumulation was discussed. The understanding is as follows: (1) The Cenozoic magmatic activity in the southwest of the Xihu Depression was mainly distributed in the northern section of the Tiantai slope belt and near the Tiantai West Fault, and the magmatic activity in the southwest gradually became stronger since the Miocene, and the magmatic activity reached its peak in the early Santan Formation. (2) The distribution of magmatic rock mass is mainly affected by the development of the basement fault system, the hysteresis effect of magmatic activity, the thickness of the sedimentary cover and other factors. (3) The relationship between magmatic activity and hydrocarbon accumulation in this area is positive and negative. Regional magmatic activity accelerates the maturation of hydrocarbon source rocks in the southwest, and is also conducive to the formation of trap morphology. However, late magmatic activity can also destroy early formed traps. [ABSTRACT FROM AUTHOR]