贵州赤水地区油气成藏特征及勘探潜力分析

Characters and the Exploration Potential Analyses of Oil and Gas Accumulation in Chishui of Guizhou

赤水地区具有较大的勘探资源潜力,总资源量3400×108m3,圈闭资源量2157.34×108m3,探明储量仅占圈闭资源量的2.1%;赋存海相、陆相两大油气系统及原生型、次生型、残存型、复合型等多种子油气系统;储集层非均质性极强,气藏富集规模及分布受沉积微相、溶蚀作用、成岩作用和构造圈闭因素的影响外,更主要是裂缝系统对油气富集成藏及油气藏规模、展布起主导作用;茅口组是赤水地区油气勘探的主体气藏,提出"以加强裂缝性储层预测为重点,以致力寻找孔缝洞大型储渗系统为核心,以钻探官渡构造带茅口组缝洞系统获规模气藏为突破口,解决赤水气田产能瓶颈问题,实现官渡构造海相领域油气勘探的突破和赤水气田新的储量接替"都具有积极的、现实的重大意义。

There is big exploration potential in the Chishui area, the total resource extent is 3400 × 10^8m^3, the trap resource extent is 2157.34 × 10^8m^3, the discovery reserves is only 2. 1% of trap resource extent, occupied in the marine and limnic oil and gas system, and the primary, secondary, relict, composite and other oil and gas system. The anisotropism of rocks strata is strong. The concentration scale of oil and gas accumulation is influenced by sedimentary micro -facies, solution process, diagenism and deformational trap. Besides these, cranny system is more important for the concentration and accumulation of oil and gas and the unrolling and distribution. Maokou formation is the main gas accumulation. It＇ s pointed out that strength the forecast of cranny strata as the key point ; searching big hole, seam and carve store and seeped system as the core ; drill the seam and carve system of Maokou formation of Guandu structural belt for big scale of gas accu- mulation as the breakthrough point. Solving the production boost of Chishui gas field; make the new storage replacement of Chishui gas field and the breakthrough of marine oil and gas explorationof Guandu structure are all has positive, realistic significance.