河北省兴隆煤田及邻区厚皮式逆冲推覆构造与隐伏煤田问题

在地质填图的基础上，确定了兴隆煤田南部逆冲推覆构造主逆冲带的平面展布特征，认为主逆冲断层在剖面上具有浅部缓深部陡的几何特征。运用平衡剖面基本原理估算出了由逆冲推覆所造成的水平缩短量约为１３７５ｋｍ。根据本区逆冲推覆构造的几何学与运动学特征，认为在推覆体下寻找到隐伏煤田的范围是极其有限的。

SINIAN ORDOVICIAN TECTONIC EVOLUTION OF NORTH TARIM AND SOUTH TIANSHAN REGION AND ITS RELATION TO OIL AND GAS

North Tarim and south Tianshan region experienced a complete cycle from extension drift to compression convergence on the basis of “Xinjiang Paleo craton”during Sinian Ordovician. The studied area can be subdivided into three roughly parallel tectonic zones related to extension at that time. From south to north they are respectively as follows: (1) south Kuruketag taphrogenic Mangar cratonic marginal depression Tarim intracratonic depression, (2) north Kuruketag Tiemenguan Laohutai uplift zone and (3) south Tianshan ocean. The tectonic evolution from Sinian to Ordovician lasted three stages: (1) Sinian extension rifting stage, (2) Cambrian Early Ordovician extensional and drifting stage and (3) Middle Late Ordovician compression converging stage. The Mangar cratonic marginal depression, showing the features of extensional basin, is a main large hydrocarbon generating depression in this region. Its thermal evolution grade was relatively high. The inherited paleo uplift zone and its ramp to the north of the Mangar depression is favourable migration direction and accumulation area for oil and gas.