罗家地区泥质岩裂缝性储集层综合研究

Composite study on fractured reservoir of argillaceous rock in Luojia Area

山东济阳坳陷沾化凹陷罗家地区沙三段泥质岩为工业产油层的岩性包括油页岩、油泥岩、灰质泥岩和泥灰岩。根据泥质岩裂缝成因,将研究区的裂缝分为4种:构造缝、层间页理缝、成岩收缩缝和异常压力缝。这4种裂缝的特征和成因机制各不相同,但构造、沉积环境、岩相及成岩作用是控制和影响裂缝发育的4个主要因素,其中构造作用影响最大。在运用三维有限元法对构造裂缝进行预测的基础上,综合考虑沉积环境、岩性及成岩作用的影响,运用“四因素法”对裂缝储集层的发育情况进行了综合预测,共划分了7个裂缝发育区带。

Argillaceous rock zone of Sha 3 interval in Luojia Area Zhanhua Sag of Shandong Jiyang Depress is the industrial oil zone; its lithology includes oil shale, oil clay, calcareous clay and marl. According to the genesis of calcareous clay fracture, the fractures in the studying area are classified to four types: tectonic, interlayer bedding, rock convergent and abnormal pressure fractures. The features and genesis mechanisms of these 4 types of fractures are different, but the tectonics, sedimentary environment, lithofacies and diagenesis are 4 main factors to control and affect the development of the fractures, while tectonic movement has the most affection among these 4 factors. Therefore, on the basis of predicting the tectonic fractures by using 3D Limit element method, considering the affect of the sedimentary condition, lithology and diagenesis, the paper predicted the fracture reservoir developing condition comprehensively by 'the four factors method' and totally 7 fracture developing blocks were divided.