CAJ | 학술논문

在区域构造背景分析的基础上，对晚白垩世–中中新世文昌凹陷的断裂系统和地层特征进行了研究，结果表明文昌凹陷应力场演化受区域扭张应力场控制，其最小主应力方向沿 NWW→NW→SN→NNE 向顺时针旋转，整体具有右旋扭张的特征。在该应力场的控制作用下，文昌凹陷共发育3种类型的扭张/压扭模式：与文昌A凹形成有关由弯曲断层控制的扭张下沉/差异隆升模式；与文昌B凹形成有关由分支断层控制的扭张楔形下沉模式；和与文昌C凹形成有关由弯曲和分支断层汇合控制的菱形扭张差异隆升/下沉模式。这三种扭张模式不仅控制了凹陷的变形格局，形成3个不同的沉降中心和2个反转构造区，更对圈闭的形成和油气运聚等成藏要素的发育有一定的控制作用。
재구역구조배경분석적기출상，대만백성세–중중신세문창요함적단렬계통화지층특정진행료연구，결과표명문창요함응력장연화수구역뉴장응력장공제，기최소주응력방향연 NWW→NW→SN→NNE 향순시침선전，정체구유우선뉴장적특정。재해응력장적공제작용하，문창요함공발육3충류형적뉴장/압뉴모식：여문창A요형성유관유만곡단층공제적뉴장하침/차이륭승모식；여문창B요형성유관유분지단층공제적뉴장설형하침모식；화여문창C요형성유관유만곡화분지단층회합공제적릉형뉴장차이륭승/하침모식。저삼충뉴장모식불부공제료요함적변형격국，형성3개불동적침강중심화2개반전구조구，경대권폐적형성화유기운취등성장요소적발육유일정적공제작용。
Characteristics of the fault system and stratigraphy of the Wenchang Sag during the Late Cretaceous to Early Miocene demonstrate that the stress field was controlled by regional oblique extension. Moreover, the minimum principal stress was characterized by right lateral transtension, which rotated clockwise from NWW to NW and from SN to NNE. We suggest that there were three kinds of transtensional structures developed in the Wenchang Sag: (1) transtensional subsidence or differential uplift controlled by curved faults and related to the formation of the Wenchang Sag A; (2) transtensional wedge subsidence pattern controlled by branch fault and related to the formation of the Wenchang Sag B;and (3) diamond transtensional differential uplift or subsidence pattern controlled by curved and branch fault and related to the formation of the Wenchang Sag C. These three transtensional patterns not only controlled the structural framework of the Wenchang Sag, formed three different subsidence centers and two reversal structure areas, but also have an effect on the hydrocarbon accumulation such as trap formation, migration and accumulation of oil and gas.